399980697600 has 432 divisors, whose sum is σ = 1453482674280. Its totient is φ = 96960512000.

The previous prime is 399980697517. The next prime is 399980697607. The reversal of 399980697600 is 6796089993.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399980697607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18574840 + ... + 18596360.

Almost surely, 2^399980697600 is an apocalyptic number.

399980697600 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 399980697600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726741337140).

399980697600 is an abundant number, since it is smaller than the sum of its proper divisors (1053501976680).

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

399980697600 is a wasteful number, since it uses less digits than its factorization.

399980697600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21578 (or 21542 counting only the distinct ones).

The product of its (nonzero) digits is 39680928, while the sum is 66.

The spelling of 399980697600 in words is "three hundred ninety-nine billion, nine hundred eighty million, six hundred ninety-seven thousand, six hundred".