23900521 has 8 divisors (see below), whose sum is σ = 25349544. Its totient is φ = 22456320.

The previous prime is 23900491. The next prime is 23900531. The reversal of 23900521 is 12500932.

It can be written as a sum of positive squares in 4 ways, for example, as 8970025 + 14930496 = 2995^2 + 3864^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23900521 - 2⁵ = 23900489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23900492 and 23900501.

It is not an unprimeable number, because it can be changed into a prime (23900531) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16881 + ... + 18241.

It is an arithmetic number, because the mean of its divisors is an integer number (3168693).

Almost surely, 2^23900521 is an apocalyptic number.

It is an amenable number.

23900521 is a deficient number, since it is larger than the sum of its proper divisors (1449023).

23900521 is a wasteful number, since it uses less digits than its factorization.

23900521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 23900521 is about 4888.8159098088. The cubic root of 23900521 is about 288.0508245243.

It can be divided in two parts, 239005 and 21, that multiplied together give a palindrome (5019105).

The spelling of 23900521 in words is "twenty-three million, nine hundred thousand, five hundred twenty-one".