18217490 has 8 divisors (see below), whose sum is σ = 32791500. Its totient is φ = 7286992.

The previous prime is 18217483. The next prime is 18217517. The reversal of 18217490 is 9471281.

It can be written as a sum of positive squares in 2 ways, for example, as 18207289 + 10201 = 4267^2 + 101^2 .

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

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, 910865 + ... + 910884.

Almost surely, 2^18217490 is an apocalyptic number.

18217490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18217490 is a deficient number, since it is larger than the sum of its proper divisors (14574010).

18217490 is a wasteful number, since it uses less digits than its factorization.

18217490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821756.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18217490 is about 4268.1951689209. The cubic root of 18217490 is about 263.1254443566.

The spelling of 18217490 in words is "eighteen million, two hundred seventeen thousand, four hundred ninety".