399362617920 has 224 divisors, whose sum is σ = 1452908740608. Its totient is φ = 91043960832.

The previous prime is 399362617799. The next prime is 399362617939. The reversal of 399362617920 is 29716263993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2496177 + ... + 2651343.

Almost surely, 2^399362617920 is an apocalyptic number.

399362617920 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 399362617920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726454370304).

399362617920 is an abundant number, since it is smaller than the sum of its proper divisors (1053546122688).

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

399362617920 is a wasteful number, since it uses less digits than its factorization.

399362617920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155577 (or 155567 counting only the distinct ones).

The product of its (nonzero) digits is 6613488, while the sum is 57.

The spelling of 399362617920 in words is "three hundred ninety-nine billion, three hundred sixty-two million, six hundred seventeen thousand, nine hundred twenty".