18198036 has 18 divisors (see below), whose sum is σ = 46000682. Its totient is φ = 6066000.

The previous prime is 18198017. The next prime is 18198053. The reversal of 18198036 is 63089181.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 608400 = 4194^2 + 780^2 .

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: 505501 = 18198036 / (1 + 8 + 1 + 9 + 8 + 0 + 3 + 6).

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 5 ways as a sum of consecutive naturals, for example, 252715 + ... + 252786.

Almost surely, 2^18198036 is an apocalyptic number.

It is an amenable number.

18198036 is an abundant number, since it is smaller than the sum of its proper divisors (27802646).

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

18198036 is a wasteful number, since it uses less digits than its factorization.

18198036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505511 (or 505506 counting only the distinct ones).

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

The square root of 18198036 is about 4265.9156109797. The cubic root of 18198036 is about 263.0317493128.

The spelling of 18198036 in words is "eighteen million, one hundred ninety-eight thousand, thirty-six".