399684926880 has 384 divisors, whose sum is σ = 1409696386560. Its totient is φ = 105763553280.

The previous prime is 399684926873. The next prime is 399684926887. The reversal of 399684926880 is 88629486993.

It is a happy number.

399684926880 is a `hidden beast` number, since 399 + 68 + 49 + 2 + 68 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (399684926873) and next prime (399684926887).

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 399684926799 and 399684926808.

It is not an unprimeable number, because it can be changed into a prime (399684926887) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 413324157 + ... + 413325123.

It is an arithmetic number, because the mean of its divisors is an integer number (3671084340).

Almost surely, 2^399684926880 is an apocalyptic number.

399684926880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399684926880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704848193280).

399684926880 is an abundant number, since it is smaller than the sum of its proper divisors (1010011459680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399684926880 is a wasteful number, since it uses less digits than its factorization.

399684926880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 322486272, while the sum is 72.

The spelling of 399684926880 in words is "three hundred ninety-nine billion, six hundred eighty-four million, nine hundred twenty-six thousand, eight hundred eighty".