18645149 has 4 divisors (see below), whose sum is σ = 18900636. Its totient is φ = 18389664.

The previous prime is 18645139. The next prime is 18645161. The reversal of 18645149 is 94154681.

18645149 = 2492² + 2493² + 2494².

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 10562500 + 8082649 = 3250^2 + 2843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18645149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18645139) 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, 127634 + ... + 127779.

It is an arithmetic number, because the mean of its divisors is an integer number (4725159).

Almost surely, 2^18645149 is an apocalyptic number.

It is an amenable number.

18645149 is a deficient number, since it is larger than the sum of its proper divisors (255487).

18645149 is an equidigital number, since it uses as much as digits as its factorization.

18645149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255486.

The product of its digits is 34560, while the sum is 38.

The square root of 18645149 is about 4318.0028948578. The cubic root of 18645149 is about 265.1685127327.

The spelling of 18645149 in words is "eighteen million, six hundred forty-five thousand, one hundred forty-nine".