18745449 has 4 divisors (see below), whose sum is σ = 24993936. Its totient is φ = 12496964.

The previous prime is 18745439. The next prime is 18745477. The reversal of 18745449 is 94454781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18745449 - 2⁹ = 18744937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18745449.

It is not an unprimeable number, because it can be changed into a prime (18745409) 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, 3124239 + ... + 3124244.

It is an arithmetic number, because the mean of its divisors is an integer number (6248484).

Almost surely, 2^18745449 is an apocalyptic number.

It is an amenable number.

18745449 is a deficient number, since it is larger than the sum of its proper divisors (6248487).

18745449 is an equidigital number, since it uses as much as digits as its factorization.

18745449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248486.

The product of its digits is 161280, while the sum is 42.

The square root of 18745449 is about 4329.6014828157. The cubic root of 18745449 is about 265.6431465157.

The spelling of 18745449 in words is "eighteen million, seven hundred forty-five thousand, four hundred forty-nine".