123742731 has 32 divisors (see below), whose sum is σ = 196263936. Its totient is φ = 67860000.

The previous prime is 123742721. The next prime is 123742733. The reversal of 123742731 is 137247321.

It is not a de Polignac number, because 123742731 - 2⁶ = 123742667 is a prime.

It is a super-2 number, since 2×123742731² = 30624526950676722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (123742733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84556 + ... + 86006.

It is an arithmetic number, because the mean of its divisors is an integer number (6133248).

Almost surely, 2^123742731 is an apocalyptic number.

123742731 is a deficient number, since it is larger than the sum of its proper divisors (72521205).

123742731 is a wasteful number, since it uses less digits than its factorization.

123742731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623.

The product of its digits is 7056, while the sum is 30.

The square root of 123742731 is about 11123.9710085922. The cubic root of 123742731 is about 498.3179893586.

The spelling of 123742731 in words is "one hundred twenty-three million, seven hundred forty-two thousand, seven hundred thirty-one".