1645353 has 28 divisors (see below), whose sum is σ = 2575108. Its totient is φ = 1049760.

The previous prime is 1645349. The next prime is 1645363. The reversal of 1645353 is 3535461.

It can be written as a sum of positive squares in 2 ways, for example, as 700569 + 944784 = 837^2 + 972^2 .

It is not a de Polignac number, because 1645353 - 2² = 1645349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 1 + 6² + 4¹⁰ + 5⁵ + 3¹⁰ + 5⁵ + 3¹² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645363) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 26943 + ... + 27003.

2^1645353 is an apocalyptic number.

It is an amenable number.

1645353 is a deficient number, since it is larger than the sum of its proper divisors (929755).

1645353 is an frugal number, since it uses more digits than its factorization.

1645353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 101 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 1645353 is about 1282.7131401837. The cubic root of 1645353 is about 118.0555373923.

It can be divided in two parts, 16 and 45353, that added together give a square (45369 = 213²).

The spelling of 1645353 in words is "one million, six hundred forty-five thousand, three hundred fifty-three".