18881245 has 4 divisors (see below), whose sum is σ = 22657500. Its totient is φ = 15104992.

The previous prime is 18881227. The next prime is 18881267. The reversal of 18881245 is 54218881.

It is a happy number.

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 5769604 + 13111641 = 2402^2 + 3621^2 .

It is a cyclic number.

It is not a de Polignac number, because 18881245 - 2⁹ = 18880733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888120 + ... + 1888129.

It is an arithmetic number, because the mean of its divisors is an integer number (5664375).

Almost surely, 2^18881245 is an apocalyptic number.

It is an amenable number.

18881245 is a deficient number, since it is larger than the sum of its proper divisors (3776255).

18881245 is an equidigital number, since it uses as much as digits as its factorization.

18881245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3776254.

The product of its digits is 20480, while the sum is 37.

The square root of 18881245 is about 4345.2554585433. The cubic root of 18881245 is about 266.2830621583.

The spelling of 18881245 in words is "eighteen million, eight hundred eighty-one thousand, two hundred forty-five".