138156974 has 8 divisors (see below), whose sum is σ = 208165440. Its totient is φ = 68768496.

The previous prime is 138156973. The next prime is 138156989. The reversal of 138156974 is 479651831.

138156974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138156971) 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, 154439 + ... + 155330.

It is an arithmetic number, because the mean of its divisors is an integer number (26020680).

Almost surely, 2^138156974 is an apocalyptic number.

138156974 is a deficient number, since it is larger than the sum of its proper divisors (70008466).

138156974 is a wasteful number, since it uses less digits than its factorization.

138156974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309994.

The product of its digits is 181440, while the sum is 44.

The square root of 138156974 is about 11754.0194827131. The cubic root of 138156974 is about 516.9607897762.

The spelling of 138156974 in words is "one hundred thirty-eight million, one hundred fifty-six thousand, nine hundred seventy-four".