18218870 has 16 divisors (see below), whose sum is σ = 33332688. Its totient is φ = 7167840.

The previous prime is 18218867. The next prime is 18218881. The reversal of 18218870 is 7881281.

It is a super-3 number, since 3×18218870³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18218870.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14324 + ... + 15543.

It is an arithmetic number, because the mean of its divisors is an integer number (2083293).

Almost surely, 2^18218870 is an apocalyptic number.

18218870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18218870 is a deficient number, since it is larger than the sum of its proper divisors (15113818).

18218870 is a wasteful number, since it uses less digits than its factorization.

18218870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29935.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 18218870 is about 4268.3568266957. The cubic root of 18218870 is about 263.1320882273.

The spelling of 18218870 in words is "eighteen million, two hundred eighteen thousand, eight hundred seventy".