399521496 has 64 divisors (see below), whose sum is σ = 1102792320. Its totient is φ = 119601920.

The previous prime is 399521491. The next prime is 399521503. The reversal of 399521496 is 694125993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399521491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12796 + ... + 31028.

It is an arithmetic number, because the mean of its divisors is an integer number (17231130).

Almost surely, 2^399521496 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 399521496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (551396160).

399521496 is an abundant number, since it is smaller than the sum of its proper divisors (703270824).

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

399521496 is a wasteful number, since it uses less digits than its factorization.

399521496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18336 (or 18332 counting only the distinct ones).

The product of its digits is 524880, while the sum is 48.

The square root of 399521496 is about 19988.0338202636. The cubic root of 399521496 is about 736.5123785268.

The spelling of 399521496 in words is "three hundred ninety-nine million, five hundred twenty-one thousand, four hundred ninety-six".