18856249 has 4 divisors (see below), whose sum is σ = 18952164. Its totient is φ = 18760336.

The previous prime is 18856219. The next prime is 18856267. The reversal of 18856249 is 94265881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94265881 = 79 ⋅1193239.

It can be written as a sum of positive squares in 2 ways, for example, as 10112400 + 8743849 = 3180^2 + 2957^2 .

It is a cyclic number.

It is not a de Polignac number, because 18856249 - 2⁵ = 18856217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18856219) 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, 47662 + ... + 48055.

It is an arithmetic number, because the mean of its divisors is an integer number (4738041).

Almost surely, 2^18856249 is an apocalyptic number.

It is an amenable number.

18856249 is a deficient number, since it is larger than the sum of its proper divisors (95915).

18856249 is an equidigital number, since it uses as much as digits as its factorization.

18856249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95914.

The product of its digits is 138240, while the sum is 43.

The square root of 18856249 is about 4342.3782654209. The cubic root of 18856249 is about 266.1655036891.

The spelling of 18856249 in words is "eighteen million, eight hundred fifty-six thousand, two hundred forty-nine".