1643562 has 12 divisors (see below), whose sum is σ = 3561090. Its totient is φ = 547848.

The previous prime is 1643539. The next prime is 1643581. The reversal of 1643562 is 2653461.

It can be written as a sum of positive squares in only one way, i.e., 1640961 + 2601 = 1281^2 + 51^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45637 + ... + 45672.

2^1643562 is an apocalyptic number.

1643562 is an abundant number, since it is smaller than the sum of its proper divisors (1917528).

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

1643562 is a wasteful number, since it uses less digits than its factorization.

1643562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91317 (or 91314 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1643562 is about 1282.0148205072. The cubic root of 1643562 is about 118.0126865609.

The spelling of 1643562 in words is "one million, six hundred forty-three thousand, five hundred sixty-two".