8399405 has 16 divisors (see below), whose sum is σ = 11789184. Its totient is φ = 5624640.

The previous prime is 8399401. The next prime is 8399423. The reversal of 8399405 is 5049938.

8399405 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8399405 - 2² = 8399401 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8399401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1286 + ... + 4295.

It is an arithmetic number, because the mean of its divisors is an integer number (736824).

Almost surely, 2^8399405 is an apocalyptic number.

It is an amenable number.

8399405 is a deficient number, since it is larger than the sum of its proper divisors (3389779).

8399405 is a wasteful number, since it uses less digits than its factorization.

8399405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 8399405 is about 2898.1727001682. The cubic root of 8399405 is about 203.2744716002.

The spelling of 8399405 in words is "eight million, three hundred ninety-nine thousand, four hundred five".