396531555 has 64 divisors (see below), whose sum is σ = 740275200. Its totient is φ = 177523200.

The previous prime is 396531533. The next prime is 396531559. The reversal of 396531555 is 555135693.

It is a happy number.

It is not a de Polignac number, because 396531555 - 2⁸ = 396531299 is a prime.

It is a super-2 number, since 2×396531555² = 314474548221436050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (396531559) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1473961 + ... + 1474229.

It is an arithmetic number, because the mean of its divisors is an integer number (11566800).

Almost surely, 2^396531555 is an apocalyptic number.

396531555 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

396531555 is a deficient number, since it is larger than the sum of its proper divisors (343743645).

396531555 is a wasteful number, since it uses less digits than its factorization.

396531555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524.

The product of its digits is 303750, while the sum is 42.

The square root of 396531555 is about 19913.1000851198. The cubic root of 396531555 is about 734.6704710051.

The spelling of 396531555 in words is "three hundred ninety-six million, five hundred thirty-one thousand, five hundred fifty-five".