396797940 has 240 divisors, whose sum is σ = 1552408704. Its totient is φ = 82425600.

The previous prime is 396797903. The next prime is 396797971. The reversal of 396797940 is 49797693.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 123150 + ... + 126330.

Almost surely, 2^396797940 is an apocalyptic number.

396797940 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 396797940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776204352).

396797940 is an abundant number, since it is smaller than the sum of its proper divisors (1155610764).

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

396797940 is a wasteful number, since it uses less digits than its factorization.

396797940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220 (or 3209 counting only the distinct ones).

The product of its (nonzero) digits is 2571912, while the sum is 54.

The square root of 396797940 is about 19919.7876494706. The cubic root of 396797940 is about 734.8349483615.

The spelling of 396797940 in words is "three hundred ninety-six million, seven hundred ninety-seven thousand, nine hundred forty".