123189732 has 18 divisors (see below), whose sum is σ = 311396358. Its totient is φ = 41063232.

The previous prime is 123189727. The next prime is 123189743. The reversal of 123189732 is 237981321.

It can be written as a sum of positive squares in only one way, i.e., 123076836 + 112896 = 11094^2 + 336^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3421937 = 123189732 / (1 + 2 + 3 + 1 + 8 + 9 + 7 + 3 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1710933 + ... + 1711004.

Almost surely, 2^123189732 is an apocalyptic number.

123189732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123189732 is an abundant number, since it is smaller than the sum of its proper divisors (188206626).

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

123189732 is a wasteful number, since it uses less digits than its factorization.

123189732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421947 (or 3421942 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 123189732 is about 11099.0869894780. The cubic root of 123189732 is about 497.5745628671.

The spelling of 123189732 in words is "one hundred twenty-three million, one hundred eighty-nine thousand, seven hundred thirty-two".