6390405 has 24 divisors (see below), whose sum is σ = 12659712. Its totient is φ = 2921184.

The previous prime is 6390401. The next prime is 6390407. The reversal of 6390405 is 5040936.

It is a happy number.

It is not a de Polignac number, because 6390405 - 2² = 6390401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9829 + ... + 10458.

It is an arithmetic number, because the mean of its divisors is an integer number (527488).

Almost surely, 2^6390405 is an apocalyptic number.

It is an amenable number.

6390405 is a deficient number, since it is larger than the sum of its proper divisors (6269307).

6390405 is a wasteful number, since it uses less digits than its factorization.

6390405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20305 (or 20302 counting only the distinct ones).

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

The square root of 6390405 is about 2527.9250384456. The cubic root of 6390405 is about 185.5707235115.

The spelling of 6390405 in words is "six million, three hundred ninety thousand, four hundred five".