138045978 has 32 divisors (see below), whose sum is σ = 350593920. Its totient is φ = 39441600.

The previous prime is 138045961. The next prime is 138045983. The reversal of 138045978 is 879540831.

It is a Curzon 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, 182223 + ... + 182978.

It is an arithmetic number, because the mean of its divisors is an integer number (10956060).

Almost surely, 2^138045978 is an apocalyptic number.

138045978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138045978 is an abundant number, since it is smaller than the sum of its proper divisors (212547942).

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

138045978 is a wasteful number, since it uses less digits than its factorization.

138045978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365219 (or 365213 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 138045978 is about 11749.2969151350. The cubic root of 138045978 is about 516.8223097279.

The spelling of 138045978 in words is "one hundred thirty-eight million, forty-five thousand, nine hundred seventy-eight".