123432639 has 16 divisors (see below), whose sum is σ = 179831424. Its totient is φ = 74685600.

The previous prime is 123432623. The next prime is 123432689. The reversal of 123432639 is 936234321.

It is not a de Polignac number, because 123432639 - 2⁴ = 123432623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123432619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20097 + ... + 25509.

It is an arithmetic number, because the mean of its divisors is an integer number (11239464).

Almost surely, 2^123432639 is an apocalyptic number.

123432639 is a deficient number, since it is larger than the sum of its proper divisors (56398785).

123432639 is a wasteful number, since it uses less digits than its factorization.

123432639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6118.

The product of its digits is 23328, while the sum is 33.

The square root of 123432639 is about 11110.0242573993. The cubic root of 123432639 is about 497.9013893233.

The spelling of 123432639 in words is "one hundred twenty-three million, four hundred thirty-two thousand, six hundred thirty-nine".