2157155 has 32 divisors (see below), whose sum is σ = 3483648. Its totient is φ = 1238400.

The previous prime is 2157151. The next prime is 2157157. The reversal of 2157155 is 5517512.

It is a happy number.

It is not a de Polignac number, because 2157155 - 2² = 2157151 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2157151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4790 + ... + 5220.

It is an arithmetic number, because the mean of its divisors is an integer number (108864).

2^2157155 is an apocalyptic number.

2157155 is a deficient number, since it is larger than the sum of its proper divisors (1326493).

2157155 is a wasteful number, since it uses less digits than its factorization.

2157155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its digits is 1750, while the sum is 26.

The square root of 2157155 is about 1468.7256380958. The cubic root of 2157155 is about 129.2093030712.

The spelling of 2157155 in words is "two million, one hundred fifty-seven thousand, one hundred fifty-five".