23539409 has 2 divisors, whose sum is σ = 23539410. Its totient is φ = 23539408.

The previous prime is 23539403. The next prime is 23539421. The reversal of 23539409 is 90493532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19775809 + 3763600 = 4447^2 + 1940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23539409 is a prime.

It is not a weakly prime, because it can be changed into another prime (23539403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11769704 + 11769705.

It is an arithmetic number, because the mean of its divisors is an integer number (11769705).

Almost surely, 2^23539409 is an apocalyptic number.

It is an amenable number.

23539409 is a deficient number, since it is larger than the sum of its proper divisors (1).

23539409 is an equidigital number, since it uses as much as digits as its factorization.

23539409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 23539409 is about 4851.7428827175. The cubic root of 23539409 is about 286.5927402366.

The spelling of 23539409 in words is "twenty-three million, five hundred thirty-nine thousand, four hundred nine".