2155764 has 36 divisors (see below), whose sum is σ = 5451936. Its totient is φ = 662688.

The previous prime is 2155733. The next prime is 2155781. The reversal of 2155764 is 4675512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1497 + ... + 2559.

2^2155764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2725968).

2155764 is an abundant number, since it is smaller than the sum of its proper divisors (3296172).

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

2155764 is a wasteful number, since it uses less digits than its factorization.

2155764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096 (or 1081 counting only the distinct ones).

The product of its digits is 8400, while the sum is 30.

The square root of 2155764 is about 1468.2520219635. The cubic root of 2155764 is about 129.1815243864.

The spelling of 2155764 in words is "two million, one hundred fifty-five thousand, seven hundred sixty-four".