18218770 has 8 divisors (see below), whose sum is σ = 32793804. Its totient is φ = 7287504.

The previous prime is 18218729. The next prime is 18218771. The reversal of 18218770 is 7781281.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 96721 = 4257^2 + 311^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18218771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910929 + ... + 910948.

Almost surely, 2^18218770 is an apocalyptic number.

18218770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18218770 is a deficient number, since it is larger than the sum of its proper divisors (14575034).

18218770 is a wasteful number, since it uses less digits than its factorization.

18218770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821884.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 18218770 is about 4268.3451125700. The cubic root of 18218770 is about 263.1316067986.

The spelling of 18218770 in words is "eighteen million, two hundred eighteen thousand, seven hundred seventy".