18190836 has 18 divisors (see below), whose sum is σ = 45982482. Its totient is φ = 6063600.

The previous prime is 18190811. The next prime is 18190841. The reversal of 18190836 is 63809181.

It can be written as a sum of positive squares in only one way, i.e., 15163236 + 3027600 = 3894^2 + 1740^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 505301 = 18190836 / (1 + 8 + 1 + 9 + 0 + 8 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 18190836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 252615 + ... + 252686.

Almost surely, 2^18190836 is an apocalyptic number.

It is an amenable number.

18190836 is an abundant number, since it is smaller than the sum of its proper divisors (27791646).

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

18190836 is a wasteful number, since it uses less digits than its factorization.

18190836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505311 (or 505306 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18190836 is about 4265.0716289413. The cubic root of 18190836 is about 262.9970554881.

The spelling of 18190836 in words is "eighteen million, one hundred ninety thousand, eight hundred thirty-six".