396920640 has 224 divisors, whose sum is σ = 1357701120. Its totient is φ = 97929216.

The previous prime is 396920639. The next prime is 396920677. The reversal of 396920640 is 46029693.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 857049 + ... + 857511.

Almost surely, 2^396920640 is an apocalyptic number.

396920640 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 396920640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678850560).

396920640 is an abundant number, since it is smaller than the sum of its proper divisors (960780480).

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

396920640 is a wasteful number, since it uses less digits than its factorization.

396920640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 396920640 is about 19922.8672635241. The cubic root of 396920640 is about 734.9106837648.

The spelling of 396920640 in words is "three hundred ninety-six million, nine hundred twenty thousand, six hundred forty".