18212170 has 16 divisors (see below), whose sum is σ = 32843880. Its totient is φ = 7271104.

The previous prime is 18212147. The next prime is 18212189. The reversal of 18212170 is 7121281.

It can be written as a sum of positive squares in 4 ways, for example, as 13402921 + 4809249 = 3661^2 + 2193^2 .

It is a super-2 number, since 2×18212170² = 663366272217800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5136 + ... + 7924.

Almost surely, 2^18212170 is an apocalyptic number.

18212170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18212170 is a deficient number, since it is larger than the sum of its proper divisors (14631710).

18212170 is a wasteful number, since it uses less digits than its factorization.

18212170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 18212170 is about 4267.5719091774. The cubic root of 18212170 is about 263.0998286131.

The spelling of 18212170 in words is "eighteen million, two hundred twelve thousand, one hundred seventy".