18238516 has 6 divisors (see below), whose sum is σ = 31917410. Its totient is φ = 9119256.

The previous prime is 18238483. The next prime is 18238523. The reversal of 18238516 is 61583281.

It can be written as a sum of positive squares in only one way, i.e., 12574116 + 5664400 = 3546^2 + 2380^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2279811 + ... + 2279818.

Almost surely, 2^18238516 is an apocalyptic number.

It is an amenable number.

18238516 is a deficient number, since it is larger than the sum of its proper divisors (13678894).

18238516 is a wasteful number, since it uses less digits than its factorization.

18238516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559633 (or 4559631 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 18238516 is about 4270.6575606105. The cubic root of 18238516 is about 263.2266355469.

The spelling of 18238516 in words is "eighteen million, two hundred thirty-eight thousand, five hundred sixteen".