396655881 has 16 divisors (see below), whose sum is σ = 564764160. Its totient is φ = 247080960.

The previous prime is 396655871. The next prime is 396655891. The reversal of 396655881 is 188556693.

It is an interprime number because it is at equal distance from previous prime (396655871) and next prime (396655891).

It is not a de Polignac number, because 396655881 - 2¹¹ = 396653833 is a prime.

It is a super-2 number, since 2×396655881² = 314671775863772322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (396655871) 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, 70840 + ... + 76233.

It is an arithmetic number, because the mean of its divisors is an integer number (35297760).

Almost surely, 2^396655881 is an apocalyptic number.

396655881 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

396655881 is a deficient number, since it is larger than the sum of its proper divisors (168108279).

396655881 is a wasteful number, since it uses less digits than its factorization.

396655881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147136.

The product of its digits is 1555200, while the sum is 51.

The square root of 396655881 is about 19916.2215543009. The cubic root of 396655881 is about 734.7472442956.

The spelling of 396655881 in words is "three hundred ninety-six million, six hundred fifty-five thousand, eight hundred eighty-one".