18984457 has 4 divisors (see below), whose sum is σ = 19426000. Its totient is φ = 18542916.

The previous prime is 18984451. The next prime is 18984463. The reversal of 18984457 is 75448981.

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 an interprime number because it is at equal distance from previous prime (18984451) and next prime (18984463).

It is a cyclic number.

It is not a de Polignac number, because 18984457 - 2¹⁵ = 18951689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18984451) 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, 220707 + ... + 220792.

It is an arithmetic number, because the mean of its divisors is an integer number (4856500).

Almost surely, 2^18984457 is an apocalyptic number.

It is an amenable number.

18984457 is a deficient number, since it is larger than the sum of its proper divisors (441543).

18984457 is an equidigital number, since it uses as much as digits as its factorization.

18984457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441542.

The product of its digits is 322560, while the sum is 46.

The square root of 18984457 is about 4357.1156743883. The cubic root of 18984457 is about 266.7673819221.

The spelling of 18984457 in words is "eighteen million, nine hundred eighty-four thousand, four hundred fifty-seven".