138707919 has 24 divisors (see below), whose sum is σ = 236367872. Its totient is φ = 76703760.

The previous prime is 138707911. The next prime is 138707927. The reversal of 138707919 is 919707831.

It is an interprime number because it is at equal distance from previous prime (138707911) and next prime (138707927).

It is not a de Polignac number, because 138707919 - 2³ = 138707911 is a prime.

It is a super-2 number, since 2×138707919² = 38479773586621122, 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 (138707911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33559 + ... + 37464.

Almost surely, 2^138707919 is an apocalyptic number.

138707919 is a deficient number, since it is larger than the sum of its proper divisors (97659953).

138707919 is a wasteful number, since it uses less digits than its factorization.

138707919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71067 (or 71064 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 138707919 is about 11777.4326149632. The cubic root of 138707919 is about 517.6470603546.

The spelling of 138707919 in words is "one hundred thirty-eight million, seven hundred seven thousand, nine hundred nineteen".