123406492872 has 64 divisors (see below), whose sum is σ = 332314879680. Its totient is φ = 37963613952.

The previous prime is 123406492813. The next prime is 123406492889. The reversal of 123406492872 is 278294604321.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1631278 + ... + 1705250.

It is an arithmetic number, because the mean of its divisors is an integer number (5192419995).

Almost surely, 2^123406492872 is an apocalyptic number.

123406492872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123406492872 is an abundant number, since it is smaller than the sum of its proper divisors (208908386808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123406492872 is a wasteful number, since it uses less digits than its factorization.

123406492872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79342 (or 79338 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 123406492872 in words is "one hundred twenty-three billion, four hundred six million, four hundred ninety-two thousand, eight hundred seventy-two".