399555479232 has 336 divisors, whose sum is σ = 1447645722432. Its totient is φ = 102528737280.

The previous prime is 399555479209. The next prime is 399555479233. The reversal of 399555479232 is 232974555993.

It is a happy number.

399555479232 is a `hidden beast` number, since 3 + 9 + 9 + 5 + 554 + 79 + 2 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 399555479232.

It is not an unprimeable number, because it can be changed into a prime (399555479233) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1836382 + ... + 2042402.

It is an arithmetic number, because the mean of its divisors is an integer number (4308469412).

Almost surely, 2^399555479232 is an apocalyptic number.

399555479232 is a gapful number since it is divisible by the number (32) 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 399555479232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723822861216).

399555479232 is an abundant number, since it is smaller than the sum of its proper divisors (1048090243200).

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

399555479232 is a wasteful number, since it uses less digits than its factorization.

399555479232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206096 (or 206083 counting only the distinct ones).

The product of its digits is 91854000, while the sum is 63.

The spelling of 399555479232 in words is "three hundred ninety-nine billion, five hundred fifty-five million, four hundred seventy-nine thousand, two hundred thirty-two".