23557493 has 16 divisors (see below), whose sum is σ = 25338096. Its totient is φ = 21864960.

The previous prime is 23557487. The next prime is 23557519. The reversal of 23557493 is 39475532.

It can be written as a sum of positive squares in 8 ways, for example, as 2553604 + 21003889 = 1598^2 + 4583^2 .

It is a cyclic number.

It is not a de Polignac number, because 23557493 - 2⁴ = 23557477 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 (23557403) 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, 80255 + ... + 80547.

It is an arithmetic number, because the mean of its divisors is an integer number (1583631).

Almost surely, 2^23557493 is an apocalyptic number.

It is an amenable number.

23557493 is a deficient number, since it is larger than the sum of its proper divisors (1780603).

23557493 is a wasteful number, since it uses less digits than its factorization.

23557493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424.

The product of its digits is 113400, while the sum is 38.

The square root of 23557493 is about 4853.6061850958. The cubic root of 23557493 is about 286.6661124621. Note that the first 3 decimals are identical.

The spelling of 23557493 in words is "twenty-three million, five hundred fifty-seven thousand, four hundred ninety-three".