138691874 has 8 divisors (see below), whose sum is σ = 209676288. Its totient is φ = 68799780.

The previous prime is 138691871. The next prime is 138691879. The reversal of 138691874 is 478196831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138691871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272762 + ... + 273269.

It is an arithmetic number, because the mean of its divisors is an integer number (26209536).

Almost surely, 2^138691874 is an apocalyptic number.

138691874 is a deficient number, since it is larger than the sum of its proper divisors (70984414).

138691874 is a wasteful number, since it uses less digits than its factorization.

138691874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546160.

The product of its digits is 290304, while the sum is 47.

The square root of 138691874 is about 11776.7514196403. The cubic root of 138691874 is about 517.6271000250.

The spelling of 138691874 in words is "one hundred thirty-eight million, six hundred ninety-one thousand, eight hundred seventy-four".