138438674 has 32 divisors (see below), whose sum is σ = 239673600. Its totient is φ = 59311440.

The previous prime is 138438661. The next prime is 138438689. The reversal of 138438674 is 476834831.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94157 + ... + 95615.

It is an arithmetic number, because the mean of its divisors is an integer number (7489800).

Almost surely, 2^138438674 is an apocalyptic number.

138438674 is a deficient number, since it is larger than the sum of its proper divisors (101234926).

138438674 is a wasteful number, since it uses less digits than its factorization.

138438674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718.

The product of its digits is 387072, while the sum is 44.

The square root of 138438674 is about 11765.9965153828. The cubic root of 138438674 is about 517.3119096764.

The spelling of 138438674 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, six hundred seventy-four".