138878074 has 4 divisors (see below), whose sum is σ = 208317114. Its totient is φ = 69439036.

The previous prime is 138878063. The next prime is 138878137. The reversal of 138878074 is 470878831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 129618225 + 9259849 = 11385^2 + 3043^2 .

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 as a sum of consecutive naturals, namely, 34719517 + ... + 34719520.

Almost surely, 2^138878074 is an apocalyptic number.

138878074 is a deficient number, since it is larger than the sum of its proper divisors (69439040).

138878074 is an equidigital number, since it uses as much as digits as its factorization.

138878074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69439039.

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 138878074 is about 11784.6541739671. The cubic root of 138878074 is about 517.8586422270.

The spelling of 138878074 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, seventy-four".