123432391 has 2 divisors, whose sum is σ = 123432392. Its totient is φ = 123432390.

The previous prime is 123432377. The next prime is 123432401. The reversal of 123432391 is 193234321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123432391 - 2⁹ = 123431879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123432691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61716195 + 61716196.

It is an arithmetic number, because the mean of its divisors is an integer number (61716196).

Almost surely, 2^123432391 is an apocalyptic number.

123432391 is a deficient number, since it is larger than the sum of its proper divisors (1).

123432391 is an equidigital number, since it uses as much as digits as its factorization.

123432391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 28.

The square root of 123432391 is about 11110.0130963019. The cubic root of 123432391 is about 497.9010558631.

The spelling of 123432391 in words is "one hundred twenty-three million, four hundred thirty-two thousand, three hundred ninety-one".