396495891 has 20 divisors (see below), whose sum is σ = 646142904. Its totient is φ = 240300000.

The previous prime is 396495889. The next prime is 396495899. The reversal of 396495891 is 198594693.

It is not a de Polignac number, because 396495891 - 2¹ = 396495889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (396495899) 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, 221610 + ... + 223391.

Almost surely, 2^396495891 is an apocalyptic number.

396495891 is a deficient number, since it is larger than the sum of its proper divisors (249647013).

396495891 is a wasteful number, since it uses less digits than its factorization.

396495891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445024 (or 445015 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 396495891 is about 19912.2045740797. The cubic root of 396495891 is about 734.6484449537.

It can be divided in two parts, 396495 and 891, that added together give a triangular number (397386 = T₈₉₁).

The spelling of 396495891 in words is "three hundred ninety-six million, four hundred ninety-five thousand, eight hundred ninety-one".