1630645 has 8 divisors (see below), whose sum is σ = 1976760. Its totient is φ = 1291200.

The previous prime is 1630633. The next prime is 1630663. The reversal of 1630645 is 5460361.

It can be written as a sum of positive squares in 4 ways, for example, as 391876 + 1238769 = 626^2 + 1113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1630645 - 2⁹ = 1630133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (247095).

2^1630645 is an apocalyptic number.

It is an amenable number.

1630645 is a deficient number, since it is larger than the sum of its proper divisors (346115).

1630645 is a wasteful number, since it uses less digits than its factorization.

1630645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1630645 is about 1276.9671099915. The cubic root of 1630645 is about 117.7027133001.

The spelling of 1630645 in words is "one million, six hundred thirty thousand, six hundred forty-five".