23557985 has 32 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 16128000.

The previous prime is 23557981. The next prime is 23557987. The reversal of 23557985 is 58975532.

23557985 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 23557985 - 2² = 23557981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23557981) 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, 69737 + ... + 70073.

It is an arithmetic number, because the mean of its divisors is an integer number (1022112).

Almost surely, 2^23557985 is an apocalyptic number.

It is an amenable number.

23557985 is a deficient number, since it is larger than the sum of its proper divisors (9149599).

23557985 is a wasteful number, since it uses less digits than its factorization.

23557985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425.

The product of its digits is 378000, while the sum is 44.

The square root of 23557985 is about 4853.6568687949. The cubic root of 23557985 is about 286.6681081293.

It can be divided in two parts, 23557 and 985, that added together give a palindrome (24542).

The spelling of 23557985 in words is "twenty-three million, five hundred fifty-seven thousand, nine hundred eighty-five".