2155018 has 8 divisors (see below), whose sum is σ = 3402720. Its totient is φ = 1020780.

The previous prime is 2155009. The next prime is 2155057. The reversal of 2155018 is 8105512.

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

It is a super-3 number, since 3×2155018³ = 30024373963333997496, which contains 333 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28318 + ... + 28393.

It is an arithmetic number, because the mean of its divisors is an integer number (425340).

2^2155018 is an apocalyptic number.

2155018 is a deficient number, since it is larger than the sum of its proper divisors (1247702).

2155018 is a wasteful number, since it uses less digits than its factorization.

2155018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56732.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2155018 is about 1467.9979564018. The cubic root of 2155018 is about 129.1666216210.

The spelling of 2155018 in words is "two million, one hundred fifty-five thousand, eighteen".