23971505 has 4 divisors (see below), whose sum is σ = 28765812. Its totient is φ = 19177200.

The previous prime is 23971489. The next prime is 23971537. The reversal of 23971505 is 50517932.

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 7333264 + 16638241 = 2708^2 + 4079^2 .

It is not a de Polignac number, because 23971505 - 2⁴ = 23971489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397146 + ... + 2397155.

It is an arithmetic number, because the mean of its divisors is an integer number (7191453).

Almost surely, 2^23971505 is an apocalyptic number.

It is an amenable number.

23971505 is a deficient number, since it is larger than the sum of its proper divisors (4794307).

23971505 is an equidigital number, since it uses as much as digits as its factorization.

23971505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4794306.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 23971505 is about 4896.0703630565. The cubic root of 23971505 is about 288.3357107923.

The spelling of 23971505 in words is "twenty-three million, nine hundred seventy-one thousand, five hundred five".