1645562 has 4 divisors (see below), whose sum is σ = 2468346. Its totient is φ = 822780.

The previous prime is 1645561. The next prime is 1645601. The reversal of 1645562 is 2655461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 519841 = 1061^2 + 721^2 .

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 as a sum of consecutive naturals, namely, 411389 + ... + 411392.

2^1645562 is an apocalyptic number.

1645562 is a deficient number, since it is larger than the sum of its proper divisors (822784).

1645562 is an equidigital number, since it uses as much as digits as its factorization.

1645562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822783.

The product of its digits is 7200, while the sum is 29.

The square root of 1645562 is about 1282.7946055390. The cubic root of 1645562 is about 118.0605358258.

The spelling of 1645562 in words is "one million, six hundred forty-five thousand, five hundred sixty-two".