138012919 has 16 divisors (see below), whose sum is σ = 159929856. Its totient is φ = 117705600.

The previous prime is 138012913. The next prime is 138012937. The reversal of 138012919 is 919210831.

It is a cyclic number.

It is not a de Polignac number, because 138012919 - 2³ = 138012911 is a prime.

It is a super-2 number, since 2×138012919² = 38095131621801122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138012911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67624 + ... + 69634.

It is an arithmetic number, because the mean of its divisors is an integer number (9995616).

Almost surely, 2^138012919 is an apocalyptic number.

138012919 is a deficient number, since it is larger than the sum of its proper divisors (21916937).

138012919 is a wasteful number, since it uses less digits than its factorization.

138012919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 138012919 is about 11747.8899807582. The cubic root of 138012919 is about 516.7810505449.

The spelling of 138012919 in words is "one hundred thirty-eight million, twelve thousand, nine hundred nineteen".