2155318 has 12 divisors (see below), whose sum is σ = 3538188. Its totient is φ = 976560.

The previous prime is 2155297. The next prime is 2155319. The reversal of 2155318 is 8135512.

It is a happy number.

It is a super-2 number, since 2×2155318² = 9290791362248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2155292 and 2155301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6730 + ... + 7042.

It is an arithmetic number, because the mean of its divisors is an integer number (294849).

2^2155318 is an apocalyptic number.

2155318 is a deficient number, since it is larger than the sum of its proper divisors (1382870).

2155318 is an equidigital number, since it uses as much as digits as its factorization.

2155318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 326 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 2155318 is about 1468.1001328247. The cubic root of 2155318 is about 129.1726151036.

The spelling of 2155318 in words is "two million, one hundred fifty-five thousand, three hundred eighteen".