23540639 has 16 divisors (see below), whose sum is σ = 25613280. Its totient is φ = 21565440.

The previous prime is 23540633. The next prime is 23540641. The reversal of 23540639 is 93604532.

It is a cyclic number.

It is not a de Polignac number, because 23540639 - 2¹⁶ = 23475103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23540633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97559 + ... + 97799.

It is an arithmetic number, because the mean of its divisors is an integer number (1600830).

Almost surely, 2^23540639 is an apocalyptic number.

23540639 is a deficient number, since it is larger than the sum of its proper divisors (2072641).

23540639 is a wasteful number, since it uses less digits than its factorization.

23540639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 23540639 is about 4851.8696396338. The cubic root of 23540639 is about 286.5977319072.

The spelling of 23540639 in words is "twenty-three million, five hundred forty thousand, six hundred thirty-nine".