138374691 has 32 divisors (see below), whose sum is σ = 227834880. Its totient is φ = 72745344.

The previous prime is 138374683. The next prime is 138374707. The reversal of 138374691 is 196473831.

It is not a de Polignac number, because 138374691 - 2³ = 138374683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138374651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105546 + ... + 106848.

It is an arithmetic number, because the mean of its divisors is an integer number (7119840).

Almost surely, 2^138374691 is an apocalyptic number.

138374691 is a deficient number, since it is larger than the sum of its proper divisors (89460189).

138374691 is a wasteful number, since it uses less digits than its factorization.

138374691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715.

The product of its digits is 108864, while the sum is 42.

The square root of 138374691 is about 11763.2772219310. The cubic root of 138374691 is about 517.2322010529.

It can be divided in two parts, 13837 and 4691, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 138374691 in words is "one hundred thirty-eight million, three hundred seventy-four thousand, six hundred ninety-one".