123432638 has 16 divisors (see below), whose sum is σ = 218425344. Its totient is φ = 51193080.

The previous prime is 123432623. The next prime is 123432689. The reversal of 123432638 is 836234321.

It is a super-2 number, since 2×123432638² = 30471232247278088, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 141770 + ... + 142637.

It is an arithmetic number, because the mean of its divisors is an integer number (13651584).

Almost surely, 2^123432638 is an apocalyptic number.

123432638 is a deficient number, since it is larger than the sum of its proper divisors (94992706).

123432638 is a wasteful number, since it uses less digits than its factorization.

123432638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284447.

The product of its digits is 20736, while the sum is 32.

The square root of 123432638 is about 11110.0242123949. The cubic root of 123432638 is about 497.9013879787.

Adding to 123432638 its reverse (836234321), we get a palindrome (959666959).

The spelling of 123432638 in words is "one hundred twenty-three million, four hundred thirty-two thousand, six hundred thirty-eight".