4390605 has 40 divisors (see below), whose sum is σ = 8110872. Its totient is φ = 2270592.

The previous prime is 4390559. The next prime is 4390613. The reversal of 4390605 is 5060934.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2368521 + 2022084 = 1539^2 + 1422^2 .

It is not a de Polignac number, because 4390605 - 2⁶ = 4390541 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14839 + ... + 15131.

Almost surely, 2^4390605 is an apocalyptic number.

4390605 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4390605 is a deficient number, since it is larger than the sum of its proper divisors (3720267).

4390605 is a wasteful number, since it uses less digits than its factorization.

4390605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 4390605 is about 2095.3770543747. The cubic root of 4390605 is about 163.7475418701.

The spelling of 4390605 in words is "four million, three hundred ninety thousand, six hundred five".