18225637 has 12 divisors (see below), whose sum is σ = 19270944. Its totient is φ = 17234360.

The previous prime is 18225611. The next prime is 18225653. The reversal of 18225637 is 73652281.

It is a happy number.

It is not a de Polignac number, because 18225637 - 2¹⁵ = 18192869 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 (18225437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69168 + ... + 69430.

It is an arithmetic number, because the mean of its divisors is an integer number (1605912).

Almost surely, 2^18225637 is an apocalyptic number.

It is an amenable number.

18225637 is a deficient number, since it is larger than the sum of its proper divisors (1045307).

18225637 is a wasteful number, since it uses less digits than its factorization.

18225637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 417 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 18225637 is about 4269.1494469039. The cubic root of 18225637 is about 263.1646624105.

The spelling of 18225637 in words is "eighteen million, two hundred twenty-five thousand, six hundred thirty-seven".