1646564 has 6 divisors (see below), whose sum is σ = 2881494. Its totient is φ = 823280.

The previous prime is 1646563. The next prime is 1646581. The reversal of 1646564 is 4656461.

Added to its reverse (4656461) it gives a triangular number (6303025 = T₃₅₅₀).

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 369664 = 1130^2 + 608^2 .

It is a super-2 number, since 2×1646564² = 5422346012192, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1646564.

It is not an unprimeable number, because it can be changed into a prime (1646563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205817 + ... + 205824.

It is an arithmetic number, because the mean of its divisors is an integer number (480249).

2^1646564 is an apocalyptic number.

It is an amenable number.

1646564 is a deficient number, since it is larger than the sum of its proper divisors (1234930).

1646564 is a wasteful number, since it uses less digits than its factorization.

1646564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411645 (or 411643 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 1646564 is about 1283.1850996641. The cubic root of 1646564 is about 118.0844937308.

Adding to 1646564 its reverse (4656461), we get a triangular number (6303025 = T₃₅₅₀).

The spelling of 1646564 in words is "one million, six hundred forty-six thousand, five hundred sixty-four".