18987674 has 32 divisors (see below), whose sum is σ = 31597776. Its totient is φ = 8519680.

The previous prime is 18987659. The next prime is 18987677. The reversal of 18987674 is 47678981.

It can be written as a sum of positive squares in 8 ways, for example, as 15015625 + 3972049 = 3875^2 + 1993^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18987677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73754 + ... + 74010.

Almost surely, 2^18987674 is an apocalyptic number.

18987674 is a deficient number, since it is larger than the sum of its proper divisors (12610102).

18987674 is a wasteful number, since it uses less digits than its factorization.

18987674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

The product of its digits is 677376, while the sum is 50.

The square root of 18987674 is about 4357.4848249879. The cubic root of 18987674 is about 266.7824493744.

The spelling of 18987674 in words is "eighteen million, nine hundred eighty-seven thousand, six hundred seventy-four".