18536149 has 4 divisors (see below), whose sum is σ = 19037164. Its totient is φ = 18035136.

The previous prime is 18536143. The next prime is 18536159. The reversal of 18536149 is 94163581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10595025 + 7941124 = 3255^2 + 2818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18536149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 500977 = 18536149 / (1 + 8 + 5 + 3 + 6 + 1 + 4 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18536143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250452 + ... + 250525.

It is an arithmetic number, because the mean of its divisors is an integer number (4759291).

Almost surely, 2^18536149 is an apocalyptic number.

It is an amenable number.

18536149 is a deficient number, since it is larger than the sum of its proper divisors (501015).

18536149 is an equidigital number, since it uses as much as digits as its factorization.

18536149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501014.

The product of its digits is 25920, while the sum is 37.

The square root of 18536149 is about 4305.3628186252. The cubic root of 18536149 is about 264.6507752988.

The spelling of 18536149 in words is "eighteen million, five hundred thirty-six thousand, one hundred forty-nine".