1645564 has 12 divisors (see below), whose sum is σ = 2941344. Its totient is φ = 805184.

The previous prime is 1645561. The next prime is 1645601. The reversal of 1645564 is 4655461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645561) 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 3 ways as a sum of consecutive naturals, for example, 4189 + ... + 4564.

It is an arithmetic number, because the mean of its divisors is an integer number (245112).

2^1645564 is an apocalyptic number.

It is an amenable number.

1645564 is a deficient number, since it is larger than the sum of its proper divisors (1295780).

1645564 is a wasteful number, since it uses less digits than its factorization.

1645564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8804 (or 8802 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 1645564 is about 1282.7953850868. The cubic root of 1645564 is about 118.0605836556.

It can be divided in two parts, 1645 and 564, that added together give a square (2209 = 47²).

The spelling of 1645564 in words is "one million, six hundred forty-five thousand, five hundred sixty-four".