18860249 has 4 divisors (see below), whose sum is σ = 18880164. Its totient is φ = 18840336.

The previous prime is 18860221. The next prime is 18860251. The reversal of 18860249 is 94206881.

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 15745024 + 3115225 = 3968^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 18860249 - 2²⁴ = 2083033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18860449) 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, 8462 + ... + 10455.

It is an arithmetic number, because the mean of its divisors is an integer number (4720041).

Almost surely, 2^18860249 is an apocalyptic number.

It is an amenable number.

18860249 is a deficient number, since it is larger than the sum of its proper divisors (19915).

18860249 is an equidigital number, since it uses as much as digits as its factorization.

18860249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19914.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 18860249 is about 4342.8388181004. The cubic root of 18860249 is about 266.1843230336.

The spelling of 18860249 in words is "eighteen million, eight hundred sixty thousand, two hundred forty-nine".