2157564 has 24 divisors (see below), whose sum is σ = 5299840. Its totient is φ = 681264.

The previous prime is 2157563. The next prime is 2157587. The reversal of 2157564 is 4657512.

It is a d-powerful number, because it can be written as 2¹⁷ + 1 + 5 + 7² + 5⁹ + 6⁵ + 4⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4504 + ... + 4959.

2^2157564 is an apocalyptic number.

It is an amenable number.

2157564 is an abundant number, since it is smaller than the sum of its proper divisors (3142276).

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

2157564 is a wasteful number, since it uses less digits than its factorization.

2157564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9489 (or 9487 counting only the distinct ones).

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

The square root of 2157564 is about 1468.8648678486. The cubic root of 2157564 is about 129.2174686512.

The spelling of 2157564 in words is "two million, one hundred fifty-seven thousand, five hundred sixty-four".