1881564 has 12 divisors (see below), whose sum is σ = 4390344. Its totient is φ = 627184.

The previous prime is 1881559. The next prime is 1881587. The reversal of 1881564 is 4651881.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 78387 + ... + 78410.

It is an arithmetic number, because the mean of its divisors is an integer number (365862).

2^1881564 is an apocalyptic number.

It is an amenable number.

1881564 is an abundant number, since it is smaller than the sum of its proper divisors (2508780).

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

1881564 is a wasteful number, since it uses less digits than its factorization.

1881564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156804 (or 156802 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 1881564 is about 1371.7011336293. The cubic root of 1881564 is about 123.4543313800.

The spelling of 1881564 in words is "one million, eight hundred eighty-one thousand, five hundred sixty-four".