18974487 has 8 divisors (see below), whose sum is σ = 28913536. Its totient is φ = 10842552.

The previous prime is 18974441. The next prime is 18974489. The reversal of 18974487 is 78447981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18974487 - 2¹⁶ = 18908951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18974489) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 451753 + ... + 451794.

It is an arithmetic number, because the mean of its divisors is an integer number (3614192).

Almost surely, 2^18974487 is an apocalyptic number.

18974487 is a deficient number, since it is larger than the sum of its proper divisors (9939049).

18974487 is an equidigital number, since it uses as much as digits as its factorization.

18974487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903557.

The product of its digits is 451584, while the sum is 48.

The square root of 18974487 is about 4355.9714186390. The cubic root of 18974487 is about 266.7206746513.

The spelling of 18974487 in words is "eighteen million, nine hundred seventy-four thousand, four hundred eighty-seven".