399949635072 has 240 divisors, whose sum is σ = 1180620828288. Its totient is φ = 120196177920.

The previous prime is 399949635031. The next prime is 399949635131. The reversal of 399949635072 is 270536949993.

It is a junction number, because it is equal to n+sod(n) for n = 399949634994 and 399949635012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11144197 + ... + 11180027.

Almost surely, 2^399949635072 is an apocalyptic number.

399949635072 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 399949635072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (590310414144).

399949635072 is an abundant number, since it is smaller than the sum of its proper divisors (780671193216).

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

399949635072 is a wasteful number, since it uses less digits than its factorization.

399949635072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35921 (or 35892 counting only the distinct ones).

The product of its (nonzero) digits is 99202320, while the sum is 66.

The spelling of 399949635072 in words is "three hundred ninety-nine billion, nine hundred forty-nine million, six hundred thirty-five thousand, seventy-two".