396327978 has 60 divisors (see below), whose sum is σ = 920063430. Its totient is φ = 127509984.

The previous prime is 396327961. The next prime is 396327983. The reversal of 396327978 is 879723693.

It can be written as a sum of positive squares in 3 ways, for example, as 386004609 + 10323369 = 19647^2 + 3213^2 .

It is a super-2 number, since 2×396327978² = 314151732291136968, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 134788 + ... + 137696.

Almost surely, 2^396327978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 396327978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460031715).

396327978 is an abundant number, since it is smaller than the sum of its proper divisors (523735452).

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

396327978 is a wasteful number, since it uses less digits than its factorization.

396327978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981 (or 2943 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 396327978 is about 19907.9877938480. The cubic root of 396327978 is about 734.5447242975.

The spelling of 396327978 in words is "three hundred ninety-six million, three hundred twenty-seven thousand, nine hundred seventy-eight".