23402431 has 24 divisors (see below), whose sum is σ = 27313776. Its totient is φ = 19916160.

The previous prime is 23402429. The next prime is 23402437. The reversal of 23402431 is 13420432.

23402431 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 23402431 - 2¹ = 23402429 is a prime.

It is a super-2 number, since 2×23402431² = 1095347553419522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23402399 and 23402408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23402437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281916 + ... + 281998.

It is an arithmetic number, because the mean of its divisors is an integer number (1138074).

Almost surely, 2^23402431 is an apocalyptic number.

23402431 is a deficient number, since it is larger than the sum of its proper divisors (3911345).

23402431 is a wasteful number, since it uses less digits than its factorization.

23402431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 23402431 is about 4837.6059161532. The cubic root of 23402431 is about 286.0357552246.

Adding to 23402431 its reverse (13420432), we get a palindrome (36822863).

The spelling of 23402431 in words is "twenty-three million, four hundred two thousand, four hundred thirty-one".