399805726932 has 60 divisors (see below), whose sum is σ = 1045233868756. Its totient is φ = 133260577920.

The previous prime is 399805726921. The next prime is 399805726937. The reversal of 399805726932 is 239627508993.

It can be written as a sum of positive squares in 2 ways, for example, as 309899302596 + 89906424336 = 556686^2 + 299844^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 399805726932.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399805726937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8179638 + ... + 8228370.

Almost surely, 2^399805726932 is an apocalyptic number.

It is an amenable number.

399805726932 is an abundant number, since it is smaller than the sum of its proper divisors (645428141824).

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

399805726932 is a wasteful number, since it uses less digits than its factorization.

399805726932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74070 (or 74059 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 63.

The spelling of 399805726932 in words is "three hundred ninety-nine billion, eight hundred five million, seven hundred twenty-six thousand, nine hundred thirty-two".