78394986 has 16 divisors (see below), whose sum is σ = 174211200. Its totient is φ = 26131644.

The previous prime is 78394963. The next prime is 78394991. The reversal of 78394986 is 68949387.

It is a super-2 number, since 2×78394986² = 12291547659880392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1451759 = 78394986 / (7 + 8 + 3 + 9 + 4 + 9 + 8 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725826 + ... + 725933.

It is an arithmetic number, because the mean of its divisors is an integer number (10888200).

Almost surely, 2^78394986 is an apocalyptic number.

78394986 is an abundant number, since it is smaller than the sum of its proper divisors (95816214).

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

78394986 is a wasteful number, since it uses less digits than its factorization.

78394986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451770 (or 1451764 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 78394986 is about 8854.0943071553. The cubic root of 78394986 is about 427.9858680226.

The spelling of 78394986 in words is "seventy-eight million, three hundred ninety-four thousand, nine hundred eighty-six".