396994323840 has 512 divisors, whose sum is σ = 1323694310400. Its totient is φ = 101117362176.

The previous prime is 396994323797. The next prime is 396994323853. The reversal of 396994323840 is 48323499693.

It is a super-2 number, since 2×396994323840² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1293140967 + ... + 1293141273.

It is an arithmetic number, because the mean of its divisors is an integer number (2585340450).

Almost surely, 2^396994323840 is an apocalyptic number.

396994323840 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 396994323840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (661847155200).

396994323840 is an abundant number, since it is smaller than the sum of its proper divisors (926699986560).

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

396994323840 is a wasteful number, since it uses less digits than its factorization.

396994323840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 60.

The spelling of 396994323840 in words is "three hundred ninety-six billion, nine hundred ninety-four million, three hundred twenty-three thousand, eight hundred forty".