396978531 has 8 divisors (see below), whose sum is σ = 529515264. Its totient is φ = 264547080.

The previous prime is 396978521. The next prime is 396978553. The reversal of 396978531 is 135879693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 396978531 - 2⁵ = 396978499 is a prime.

It is a super-2 number, since 2×396978531² = 315183908149835922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (396978511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17055 + ... + 32936.

It is an arithmetic number, because the mean of its divisors is an integer number (66189408).

Almost surely, 2^396978531 is an apocalyptic number.

396978531 is a deficient number, since it is larger than the sum of its proper divisors (132536733).

396978531 is a wasteful number, since it uses less digits than its factorization.

396978531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52641.

The product of its digits is 1224720, while the sum is 51.

The square root of 396978531 is about 19924.3200887759. The cubic root of 396978531 is about 734.9464110126.

The spelling of 396978531 in words is "three hundred ninety-six million, nine hundred seventy-eight thousand, five hundred thirty-one".