8397149978 has 32 divisors (see below), whose sum is σ = 15366205440. Its totient is φ = 3361342320.

The previous prime is 8397149941. The next prime is 8397150011. The reversal of 8397149978 is 8799417938.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203426 + ... + 241197.

It is an arithmetic number, because the mean of its divisors is an integer number (480193920).

Almost surely, 2^8397149978 is an apocalyptic number.

8397149978 is a deficient number, since it is larger than the sum of its proper divisors (6969055462).

8397149978 is a wasteful number, since it uses less digits than its factorization.

8397149978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444722.

The product of its digits is 27433728, while the sum is 65.

The square root of 8397149978 is about 91635.9644353678. The cubic root of 8397149978 is about 2032.5627866733.

The spelling of 8397149978 in words is "eight billion, three hundred ninety-seven million, one hundred forty-nine thousand, nine hundred seventy-eight".