123891238 has 4 divisors (see below), whose sum is σ = 185836860. Its totient is φ = 61945618.

The previous prime is 123891233. The next prime is 123891239. The reversal of 123891238 is 832198321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832198321 = 73 ⋅11399977.

It is a junction number, because it is equal to n+sod(n) for n = 123891197 and 123891206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123891233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30972808 + ... + 30972811.

It is an arithmetic number, because the mean of its divisors is an integer number (46459215).

Almost surely, 2^123891238 is an apocalyptic number.

123891238 is a deficient number, since it is larger than the sum of its proper divisors (61945622).

123891238 is an equidigital number, since it uses as much as digits as its factorization.

123891238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61945621.

The product of its digits is 20736, while the sum is 37.

The square root of 123891238 is about 11130.6440963675. The cubic root of 123891238 is about 498.5172579652.

The spelling of 123891238 in words is "one hundred twenty-three million, eight hundred ninety-one thousand, two hundred thirty-eight".