123402431 has 2 divisors, whose sum is σ = 123402432. Its totient is φ = 123402430.

The previous prime is 123402407. The next prime is 123402467. The reversal of 123402431 is 134204321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123402431 - 2¹⁴ = 123386047 is a prime.

It is a super-2 number, since 2×123402431² = 30456319953419522, which contains 22 as substring.

It is equal to p_7024322 and since 123402431 and 7024322 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123402931) by changing a digit.

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 as a sum of consecutive naturals, namely, 61701215 + 61701216.

It is an arithmetic number, because the mean of its divisors is an integer number (61701216).

Almost surely, 2^123402431 is an apocalyptic number.

123402431 is a deficient number, since it is larger than the sum of its proper divisors (1).

123402431 is an equidigital number, since it uses as much as digits as its factorization.

123402431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123402431 is about 11108.6646812297. The cubic root of 123402431 is about 497.8607684296.

Adding to 123402431 its reverse (134204321), we get a palindrome (257606752).

The spelling of 123402431 in words is "one hundred twenty-three million, four hundred two thousand, four hundred thirty-one".