138640874 has 8 divisors (see below), whose sum is σ = 208036128. Its totient is φ = 69295500.

The previous prime is 138640871. The next prime is 138640883. The reversal of 138640874 is 478046831.

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 (138640871) 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, 4502 + ... + 17249.

It is an arithmetic number, because the mean of its divisors is an integer number (26004516).

Almost surely, 2^138640874 is an apocalyptic number.

138640874 is a deficient number, since it is larger than the sum of its proper divisors (69395254).

138640874 is a wasteful number, since it uses less digits than its factorization.

138640874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24940.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 138640874 is about 11774.5859375181. The cubic root of 138640874 is about 517.5636446885.

The spelling of 138640874 in words is "one hundred thirty-eight million, six hundred forty thousand, eight hundred seventy-four".