123972790138 has 8 divisors (see below), whose sum is σ = 186265544832. Its totient is φ = 61884275196.

The previous prime is 123972790111. The next prime is 123972790163. The reversal of 123972790138 is 831097279321.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51058420 + ... + 51060847.

It is an arithmetic number, because the mean of its divisors is an integer number (23283193104).

Almost surely, 2^123972790138 is an apocalyptic number.

123972790138 is a deficient number, since it is larger than the sum of its proper divisors (62292754694).

123972790138 is a wasteful number, since it uses less digits than its factorization.

123972790138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102119876.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 123972790138 in words is "one hundred twenty-three billion, nine hundred seventy-two million, seven hundred ninety thousand, one hundred thirty-eight".