23231905 has 4 divisors (see below), whose sum is σ = 27878292. Its totient is φ = 18585520.

The previous prime is 23231891. The next prime is 23231941. The reversal of 23231905 is 50913232.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16257024 + 6974881 = 4032^2 + 2641^2 .

It is not a de Polignac number, because 23231905 - 2⁷ = 23231777 is a prime.

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 23231905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2323186 + ... + 2323195.

It is an arithmetic number, because the mean of its divisors is an integer number (6969573).

Almost surely, 2^23231905 is an apocalyptic number.

It is an amenable number.

23231905 is a deficient number, since it is larger than the sum of its proper divisors (4646387).

23231905 is an equidigital number, since it uses as much as digits as its factorization.

23231905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4646386.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 23231905 is about 4819.9486511788. The cubic root of 23231905 is about 285.3393106528.

It can be divided in two parts, 2 and 3231905, that multiplied together give a triangular number (6463810 = T₃₅₉₅).

The spelling of 23231905 in words is "twenty-three million, two hundred thirty-one thousand, nine hundred five".