4390445 has 4 divisors (see below), whose sum is σ = 5268540. Its totient is φ = 3512352.

The previous prime is 4390433. The next prime is 4390453. The reversal of 4390445 is 5440934.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2137444 + 2253001 = 1462^2 + 1501^2 .

It is a cyclic number.

It is not a de Polignac number, because 4390445 - 2⁶ = 4390381 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439040 + ... + 439049.

It is an arithmetic number, because the mean of its divisors is an integer number (1317135).

Almost surely, 2^4390445 is an apocalyptic number.

It is an amenable number.

4390445 is a deficient number, since it is larger than the sum of its proper divisors (878095).

4390445 is an equidigital number, since it uses as much as digits as its factorization.

4390445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878094.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 4390445 is about 2095.3388747408. The cubic root of 4390445 is about 163.7455527802.

The spelling of 4390445 in words is "four million, three hundred ninety thousand, four hundred forty-five".