2156965 has 8 divisors (see below), whose sum is σ = 2596248. Its totient is φ = 1720320.

The previous prime is 2156939. The next prime is 2156993. The reversal of 2156965 is 5696512.

2156965 = 1038² + 1039².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 438244 + 1718721 = 662^2 + 1311^2 .

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

It is not a de Polignac number, because 2156965 - 2¹⁵ = 2124197 is a prime.

It is a super-2 number, since 2×2156965² = 9304996022450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156965.

It is a congruent number.

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, 2869 + ... + 3541.

It is an arithmetic number, because the mean of its divisors is an integer number (324531).

2^2156965 is an apocalyptic number.

2156965 is the 1039-th centered square number.

It is an amenable number.

2156965 is a deficient number, since it is larger than the sum of its proper divisors (439283).

2156965 is an equidigital number, since it uses as much as digits as its factorization.

2156965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319.

The product of its digits is 16200, while the sum is 34.

The square root of 2156965 is about 1468.6609547476. The cubic root of 2156965 is about 129.2055094188.

The spelling of 2156965 in words is "two million, one hundred fifty-six thousand, nine hundred sixty-five".