1303645 has 24 divisors (see below), whose sum is σ = 1932984. Its totient is φ = 838656.

The previous prime is 1303633. The next prime is 1303667. The reversal of 1303645 is 5463031.

It can be written as a sum of positive squares in 4 ways, for example, as 17689 + 1285956 = 133^2 + 1134^2 .

It is not a de Polignac number, because 1303645 - 2⁵ = 1303613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4009 + ... + 4321.

It is an arithmetic number, because the mean of its divisors is an integer number (80541).

2^1303645 is an apocalyptic number.

It is an amenable number.

1303645 is a deficient number, since it is larger than the sum of its proper divisors (629339).

1303645 is a wasteful number, since it uses less digits than its factorization.

1303645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 1303645 is about 1141.7727444636. The cubic root of 1303645 is about 109.2411963784.

Adding to 1303645 its reverse (5463031), we get a palindrome (6766676).

The spelling of 1303645 in words is "one million, three hundred three thousand, six hundred forty-five".