23990505 has 32 divisors (see below), whose sum is σ = 47858688. Its totient is φ = 9969600.

The previous prime is 23990459. The next prime is 23990509. The reversal of 23990505 is 50509932.

It is not a de Polignac number, because 23990505 - 2⁷ = 23990377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (23990509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9231 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (1495584).

Almost surely, 2^23990505 is an apocalyptic number.

It is an amenable number.

23990505 is a deficient number, since it is larger than the sum of its proper divisors (23868183).

23990505 is a wasteful number, since it uses less digits than its factorization.

23990505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20797.

The product of its (nonzero) digits is 12150, while the sum is 33.

The square root of 23990505 is about 4898.0103103199. The cubic root of 23990505 is about 288.4118697115.

It can be divided in two parts, 23 and 990505, that added together give a triangular number (990528 = T₁₄₀₇).

The spelling of 23990505 in words is "twenty-three million, nine hundred ninety thousand, five hundred five".