2215917 has 24 divisors (see below), whose sum is σ = 3625440. Its totient is φ = 1341360.

The previous prime is 2215903. The next prime is 2215921. The reversal of 2215917 is 7195122.

It is not a de Polignac number, because 2215917 - 2⁴ = 2215901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2259 + ... + 3087.

It is an arithmetic number, because the mean of its divisors is an integer number (151060).

2^2215917 is an apocalyptic number.

2215917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2215917 is a deficient number, since it is larger than the sum of its proper divisors (1409523).

2215917 is an equidigital number, since it uses as much as digits as its factorization.

2215917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 843 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2215917 is about 1488.5956469102. The cubic root of 2215917 is about 130.3720505733.

The spelling of 2215917 in words is "two million, two hundred fifteen thousand, nine hundred seventeen".