18237816 has 48 divisors (see below), whose sum is σ = 49592400. Its totient is φ = 6054912.

The previous prime is 18237799. The next prime is 18237823. The reversal of 18237816 is 61873281.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31320 + ... + 31896.

It is an arithmetic number, because the mean of its divisors is an integer number (1033175).

Almost surely, 2^18237816 is an apocalyptic number.

It is an amenable number.

18237816 is an abundant number, since it is smaller than the sum of its proper divisors (31354584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18237816 is a wasteful number, since it uses less digits than its factorization.

18237816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028 (or 1021 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18237816 is about 4270.5756052317. The cubic root of 18237816 is about 263.2232679300.

Subtracting from 18237816 its sum of digits (36), we obtain a triangular number (18237780 = T₆₀₃₉).

The spelling of 18237816 in words is "eighteen million, two hundred thirty-seven thousand, eight hundred sixteen".