18987454 has 4 divisors (see below), whose sum is σ = 28481184. Its totient is φ = 9493726.

The previous prime is 18987391. The next prime is 18987457. The reversal of 18987454 is 45478981.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4746862 + ... + 4746865.

It is an arithmetic number, because the mean of its divisors is an integer number (7120296).

Almost surely, 2^18987454 is an apocalyptic number.

18987454 is a deficient number, since it is larger than the sum of its proper divisors (9493730).

18987454 is an equidigital number, since it uses as much as digits as its factorization.

18987454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493729.

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

The square root of 18987454 is about 4357.4595809944. The cubic root of 18987454 is about 266.7814190153.

The spelling of 18987454 in words is "eighteen million, nine hundred eighty-seven thousand, four hundred fifty-four".