18775249 has 6 divisors (see below), whose sum is σ = 19815810. Its totient is φ = 17786736.

The previous prime is 18775217. The next prime is 18775261. The reversal of 18775249 is 94257781.

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 9025 = 4332^2 + 95^2 .

It is not a de Polignac number, because 18775249 - 2⁵ = 18775217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18775279) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25644 + ... + 26365.

It is an arithmetic number, because the mean of its divisors is an integer number (3302635).

Almost surely, 2^18775249 is an apocalyptic number.

18775249 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18775249 is a deficient number, since it is larger than the sum of its proper divisors (1040561).

18775249 is an equidigital number, since it uses as much as digits as its factorization.

18775249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52047 (or 52028 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 18775249 is about 4333.0415414579. The cubic root of 18775249 is about 265.7838379913.

The spelling of 18775249 in words is "eighteen million, seven hundred seventy-five thousand, two hundred forty-nine".