396978139591 has 24 divisors (see below), whose sum is σ = 437499382320. Its totient is φ = 359938212480.

The previous prime is 396978139583. The next prime is 396978139619. The reversal of 396978139591 is 195931879693.

It is not a de Polignac number, because 396978139591 - 2³ = 396978139583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 396978139591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396978139531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89066235 + ... + 89070691.

It is an arithmetic number, because the mean of its divisors is an integer number (18229140930).

Almost surely, 2^396978139591 is an apocalyptic number.

396978139591 is a deficient number, since it is larger than the sum of its proper divisors (40521242729).

396978139591 is a wasteful number, since it uses less digits than its factorization.

396978139591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6255 (or 6244 counting only the distinct ones).

The product of its digits is 99202320, while the sum is 70.

The spelling of 396978139591 in words is "three hundred ninety-six billion, nine hundred seventy-eight million, one hundred thirty-nine thousand, five hundred ninety-one".