23621639 has 2 divisors, whose sum is σ = 23621640. Its totient is φ = 23621638.

The previous prime is 23621603. The next prime is 23621657. The reversal of 23621639 is 93612632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23621639 - 2¹⁶ = 23556103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23621669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11810819 + 11810820.

It is an arithmetic number, because the mean of its divisors is an integer number (11810820).

Almost surely, 2^23621639 is an apocalyptic number.

23621639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23621639 is an equidigital number, since it uses as much as digits as its factorization.

23621639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 32.

The square root of 23621639 is about 4860.2097691355. The cubic root of 23621639 is about 286.9260696558.

The spelling of 23621639 in words is "twenty-three million, six hundred twenty-one thousand, six hundred thirty-nine".