23440431 has 16 divisors (see below), whose sum is σ = 36068864. Its totient is φ = 13263264.

The previous prime is 23440423. The next prime is 23440441. The reversal of 23440431 is 13404432.

It is not a de Polignac number, because 23440431 - 2³ = 23440423 is a prime.

It is a super-2 number, since 2×23440431² = 1098907610931522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23440398 and 23440407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3256 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (2254304).

Almost surely, 2^23440431 is an apocalyptic number.

23440431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23440431 is a deficient number, since it is larger than the sum of its proper divisors (12628433).

23440431 is a wasteful number, since it uses less digits than its factorization.

23440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10950.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 23440431 is about 4841.5318856742. The cubic root of 23440431 is about 286.1904895898.

Adding to 23440431 its reverse (13404432), we get a palindrome (36844863).

It can be divided in two parts, 23440 and 431, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 23440431 in words is "twenty-three million, four hundred forty thousand, four hundred thirty-one".