1920564 has 24 divisors (see below), whose sum is σ = 4979520. Its totient is φ = 640152.

The previous prime is 1920551. The next prime is 1920571. The reversal of 1920564 is 4650291.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8784 + ... + 8999.

It is an arithmetic number, because the mean of its divisors is an integer number (207480).

2^1920564 is an apocalyptic number.

It is an amenable number.

1920564 is an abundant number, since it is smaller than the sum of its proper divisors (3058956).

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

1920564 is a wasteful number, since it uses less digits than its factorization.

1920564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17796 (or 17788 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1920564 is about 1385.8441470815. The cubic root of 1920564 is about 124.3014690407.

The spelling of 1920564 in words is "one million, nine hundred twenty thousand, five hundred sixty-four".