8390385 has 20 divisors (see below), whose sum is σ = 15041268. Its totient is φ = 4474656.

The previous prime is 8390359. The next prime is 8390399. The reversal of 8390385 is 5830938.

It can be written as a sum of positive squares in 2 ways, for example, as 1245456 + 7144929 = 1116^2 + 2673^2 .

It is not a de Polignac number, because 8390385 - 2⁷ = 8390257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9954 + ... + 10763.

Almost surely, 2^8390385 is an apocalyptic number.

It is an amenable number.

8390385 is a deficient number, since it is larger than the sum of its proper divisors (6650883).

8390385 is a wasteful number, since it uses less digits than its factorization.

8390385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20734 (or 20725 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 8390385 is about 2896.6161292101. The cubic root of 8390385 is about 203.2016810290.

The spelling of 8390385 in words is "eight million, three hundred ninety thousand, three hundred eighty-five".