399521036157 has 16 divisors (see below), whose sum is σ = 564066800640. Its totient is φ = 250663375872.

The previous prime is 399521036099. The next prime is 399521036209. The reversal of 399521036157 is 751630125993.

It is not a de Polignac number, because 399521036157 - 2⁶ = 399521036093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399521036557) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 549813 + ... + 1049445.

It is an arithmetic number, because the mean of its divisors is an integer number (35254175040).

Almost surely, 2^399521036157 is an apocalyptic number.

It is an amenable number.

399521036157 is a deficient number, since it is larger than the sum of its proper divisors (164545764483).

399521036157 is a wasteful number, since it uses less digits than its factorization.

399521036157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515332.

The product of its (nonzero) digits is 1530900, while the sum is 51.

The spelling of 399521036157 in words is "three hundred ninety-nine billion, five hundred twenty-one million, thirty-six thousand, one hundred fifty-seven".