396881856 has 140 divisors (see below), whose sum is σ = 1344673968. Its totient is φ = 113384448.

The previous prime is 396881851. The next prime is 396881857. The reversal of 396881856 is 658188693.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396881851) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30820 + ... + 41756.

Almost surely, 2^396881856 is an apocalyptic number.

396881856 is a gapful number since it is divisible by the number (36) 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 396881856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672336984).

396881856 is an abundant number, since it is smaller than the sum of its proper divisors (947792112).

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

396881856 is a wasteful number, since it uses less digits than its factorization.

396881856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10968 (or 10949 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 396881856 is about 19921.8938858734. The cubic root of 396881856 is about 734.8867463984.

The spelling of 396881856 in words is "three hundred ninety-six million, eight hundred eighty-one thousand, eight hundred fifty-six".