2145564 has 36 divisors (see below), whose sum is σ = 5484024. Its totient is φ = 707232.

The previous prime is 2145551. The next prime is 2145617. The reversal of 2145564 is 4655412.

It is a tau number, because it is divible by the number of its divisors (36).

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, 3574 + ... + 4130.

It is an arithmetic number, because the mean of its divisors is an integer number (152334).

2^2145564 is an apocalyptic number.

It is an amenable number.

2145564 is an abundant number, since it is smaller than the sum of its proper divisors (3338460).

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

2145564 is a wasteful number, since it uses less digits than its factorization.

2145564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 669 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 2145564 is about 1464.7743853577. The cubic root of 2145564 is about 128.9774613589.

It can be divided in two parts, 214 and 5564, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 2145564 in words is "two million, one hundred forty-five thousand, five hundred sixty-four".