2157156 has 18 divisors (see below), whose sum is σ = 5452902. Its totient is φ = 719040.

The previous prime is 2157151. The next prime is 2157157. The reversal of 2157156 is 6517512.

It can be written as a sum of positive squares in only one way, i.e., 2005056 + 152100 = 1416^2 + 390^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 29925 + ... + 29996.

It is an arithmetic number, because the mean of its divisors is an integer number (302939).

2^2157156 is an apocalyptic number.

It is an amenable number.

2157156 is an abundant number, since it is smaller than the sum of its proper divisors (3295746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157156 is a wasteful number, since it uses less digits than its factorization.

2157156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59931 (or 59926 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 2157156 is about 1468.7259785270. The cubic root of 2157156 is about 129.2093230372.

The spelling of 2157156 in words is "two million, one hundred fifty-seven thousand, one hundred fifty-six".