23643431 has 6 divisors (see below), whose sum is σ = 27503640. Its totient is φ = 20265756.

The previous prime is 23643427. The next prime is 23643443. The reversal of 23643431 is 13434632.

It is a happy number.

It is not a de Polignac number, because 23643431 - 2² = 23643427 is a prime.

It is a super-2 number, since 2×23643431² = 1118023658903522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23643431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23643401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 241211 + ... + 241308.

It is an arithmetic number, because the mean of its divisors is an integer number (4583940).

Almost surely, 2^23643431 is an apocalyptic number.

23643431 is a deficient number, since it is larger than the sum of its proper divisors (3860209).

23643431 is an equidigital number, since it uses as much as digits as its factorization.

23643431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482533 (or 482526 counting only the distinct ones).

The product of its digits is 5184, while the sum is 26.

The square root of 23643431 is about 4862.4511308598. The cubic root of 23643431 is about 287.0142765058.

The spelling of 23643431 in words is "twenty-three million, six hundred forty-three thousand, four hundred thirty-one".