399535538688 has 320 divisors, whose sum is σ = 1389417321600. Its totient is φ = 111757639680.

The previous prime is 399535538681. The next prime is 399535538719. The reversal of 399535538688 is 886835535993.

399535538688 is a `hidden beast` number, since 3 + 9 + 9 + 5 + 3 + 5 + 538 + 6 + 88 = 666.

It is a super-2 number, since 2×399535538688² (a number of 24 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (399535538681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1875778 + ... + 2077886.

It is an arithmetic number, because the mean of its divisors is an integer number (4341929130).

Almost surely, 2^399535538688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399535538688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694708660800).

399535538688 is an abundant number, since it is smaller than the sum of its proper divisors (989881782912).

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

399535538688 is a wasteful number, since it uses less digits than its factorization.

399535538688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202160 (or 202138 counting only the distinct ones).

The product of its digits is 839808000, while the sum is 72.

The spelling of 399535538688 in words is "three hundred ninety-nine billion, five hundred thirty-five million, five hundred thirty-eight thousand, six hundred eighty-eight".