4390645 has 12 divisors (see below), whose sum is σ = 6129324. Its totient is φ = 3010560.

The previous prime is 4390621. The next prime is 4390651. The reversal of 4390645 is 5460934.

It can be written as a sum of positive squares in 2 ways, for example, as 603729 + 3786916 = 777^2 + 1946^2 .

It is not a de Polignac number, because 4390645 - 2⁵ = 4390613 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 11 ways as a sum of consecutive naturals, for example, 8716 + ... + 9205.

It is an arithmetic number, because the mean of its divisors is an integer number (510777).

Almost surely, 2^4390645 is an apocalyptic number.

It is an amenable number.

4390645 is a deficient number, since it is larger than the sum of its proper divisors (1738679).

4390645 is a wasteful number, since it uses less digits than its factorization.

4390645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17940 (or 17933 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 4390645 is about 2095.3865991745. The cubic root of 4390645 is about 163.7480391351.

The spelling of 4390645 in words is "four million, three hundred ninety thousand, six hundred forty-five".