137807978 has 32 divisors (see below), whose sum is σ = 258422400. Its totient is φ = 53544960.

The previous prime is 137807963. The next prime is 137807987. The reversal of 137807978 is 879708731.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 68150 + ... + 70142.

It is an arithmetic number, because the mean of its divisors is an integer number (8075700).

Almost surely, 2^137807978 is an apocalyptic number.

137807978 is a deficient number, since it is larger than the sum of its proper divisors (120614422).

137807978 is a wasteful number, since it uses less digits than its factorization.

137807978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462.

The product of its (nonzero) digits is 592704, while the sum is 50.

The square root of 137807978 is about 11739.1642803055. The cubic root of 137807978 is about 516.5251274219.

The spelling of 137807978 in words is "one hundred thirty-seven million, eight hundred seven thousand, nine hundred seventy-eight".