18987274 has 8 divisors (see below), whose sum is σ = 28548288. Its totient is φ = 9471180.

The previous prime is 18987263. The next prime is 18987299. The reversal of 18987274 is 47278981.

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10152 + ... + 11875.

It is an arithmetic number, because the mean of its divisors is an integer number (3568536).

Almost surely, 2^18987274 is an apocalyptic number.

18987274 is a deficient number, since it is larger than the sum of its proper divisors (9561014).

18987274 is a wasteful number, since it uses less digits than its factorization.

18987274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22460.

The product of its digits is 225792, while the sum is 46.

The square root of 18987274 is about 4357.4389267091. The cubic root of 18987274 is about 266.7805759883.

The spelling of 18987274 in words is "eighteen million, nine hundred eighty-seven thousand, two hundred seventy-four".