138912370 has 16 divisors (see below), whose sum is σ = 252519768. Its totient is φ = 55014400.

The previous prime is 138912359. The next prime is 138912377. The reversal of 138912370 is 73219831.

It can be written as a sum of positive squares in 4 ways, for example, as 138791961 + 120409 = 11781^2 + 347^2 .

It is not an unprimeable number, because it can be changed into a prime (138912377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67759 + ... + 69778.

Almost surely, 2^138912370 is an apocalyptic number.

138912370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138912370 is a deficient number, since it is larger than the sum of its proper divisors (113607398).

138912370 is a wasteful number, since it uses less digits than its factorization.

138912370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137645.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 138912370 is about 11786.1091968469. The cubic root of 138912370 is about 517.9012671898.

It can be divided in two parts, 13891 and 2370, that added together give a palindrome (16261).

The spelling of 138912370 in words is "one hundred thirty-eight million, nine hundred twelve thousand, three hundred seventy".