123991975 has 6 divisors (see below), whose sum is σ = 153750080. Its totient is φ = 99193560.

The previous prime is 123991949. The next prime is 123991979. The reversal of 123991975 is 579199321.

It is not a de Polignac number, because 123991975 - 2⁹ = 123991463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123991979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2479815 + ... + 2479864.

Almost surely, 2^123991975 is an apocalyptic number.

123991975 is a deficient number, since it is larger than the sum of its proper divisors (29758105).

123991975 is an equidigital number, since it uses as much as digits as its factorization.

123991975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4959689 (or 4959684 counting only the distinct ones).

The product of its digits is 153090, while the sum is 46.

The square root of 123991975 is about 11135.1683866927. The cubic root of 123991975 is about 498.6523375420.

The spelling of 123991975 in words is "one hundred twenty-three million, nine hundred ninety-one thousand, nine hundred seventy-five".