1921564 has 6 divisors (see below), whose sum is σ = 3362744. Its totient is φ = 960780.

The previous prime is 1921559. The next prime is 1921573. The reversal of 1921564 is 4651291.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 240192 + ... + 240199.

2^1921564 is an apocalyptic number.

It is an amenable number.

1921564 is a deficient number, since it is larger than the sum of its proper divisors (1441180).

1921564 is a wasteful number, since it uses less digits than its factorization.

1921564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480395 (or 480393 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 1921564 is about 1386.2048910605. The cubic root of 1921564 is about 124.3230390763.

It can be divided in two parts, 1921 and 564, that added together give a triangular number (2485 = T₇₀).

The spelling of 1921564 in words is "one million, nine hundred twenty-one thousand, five hundred sixty-four".