138765898 has 4 divisors (see below), whose sum is σ = 208148850. Its totient is φ = 69382948.

The previous prime is 138765881. The next prime is 138765931. The reversal of 138765898 is 898567831.

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., 131492089 + 7273809 = 11467^2 + 2697^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34691473 + ... + 34691476.

Almost surely, 2^138765898 is an apocalyptic number.

138765898 is a deficient number, since it is larger than the sum of its proper divisors (69382952).

138765898 is an equidigital number, since it uses as much as digits as its factorization.

138765898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69382951.

The product of its digits is 2903040, while the sum is 55.

The square root of 138765898 is about 11779.8938025773. The cubic root of 138765898 is about 517.7191746660.

The spelling of 138765898 in words is "one hundred thirty-eight million, seven hundred sixty-five thousand, eight hundred ninety-eight".