2155965 has 16 divisors (see below), whose sum is σ = 3942528. Its totient is φ = 985536.

The previous prime is 2155963. The next prime is 2155999. The reversal of 2155965 is 5695512.

It is not a de Polignac number, because 2155965 - 2¹ = 2155963 is a prime.

2155965 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10162 + ... + 10371.

It is an arithmetic number, because the mean of its divisors is an integer number (246408).

2^2155965 is an apocalyptic number.

It is an amenable number.

2155965 is a deficient number, since it is larger than the sum of its proper divisors (1786563).

2155965 is a wasteful number, since it uses less digits than its factorization.

2155965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20548.

The product of its digits is 13500, while the sum is 33.

The square root of 2155965 is about 1468.3204691075. The cubic root of 2155965 is about 129.1855391548.

The spelling of 2155965 in words is "two million, one hundred fifty-five thousand, nine hundred sixty-five".