4390906 has 16 divisors (see below), whose sum is σ = 7130088. Its totient is φ = 2016000.

The previous prime is 4390889. The next prime is 4390909. The reversal of 4390906 is 6090934.

It can be written as a sum of positive squares in 4 ways, for example, as 3980025 + 410881 = 1995^2 + 641^2 .

It is not an unprimeable number, because it can be changed into a prime (4390909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7006 + ... + 7606.

Almost surely, 2^4390906 is an apocalyptic number.

4390906 is a deficient number, since it is larger than the sum of its proper divisors (2739182).

4390906 is a wasteful number, since it uses less digits than its factorization.

4390906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 4390906 is about 2095.4488779257. The cubic root of 4390906 is about 163.7512837147.

The spelling of 4390906 in words is "four million, three hundred ninety thousand, nine hundred six".