23400431 has 4 divisors (see below), whose sum is σ = 23436600. Its totient is φ = 23364264.

The previous prime is 23400427. The next prime is 23400451. The reversal of 23400431 is 13400432.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23400431 - 2² = 23400427 is a prime.

It is a super-2 number, since 2×23400431² = 1095160341971522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23400451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17096 + ... + 18413.

It is an arithmetic number, because the mean of its divisors is an integer number (5859150).

Almost surely, 2^23400431 is an apocalyptic number.

23400431 is a deficient number, since it is larger than the sum of its proper divisors (36169).

23400431 is an equidigital number, since it uses as much as digits as its factorization.

23400431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36168.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 23400431 is about 4837.3991979162. The cubic root of 23400431 is about 286.0276066722.

Adding to 23400431 its reverse (13400432), we get a palindrome (36800863).

Subtracting from 23400431 its reverse (13400432), we obtain a palindrome (9999999).

The spelling of 23400431 in words is "twenty-three million, four hundred thousand, four hundred thirty-one".