6390605 has 8 divisors (see below), whose sum is σ = 8258712. Its totient is φ = 4719168.

The previous prime is 6390583. The next prime is 6390611. The reversal of 6390605 is 5060936.

It can be written as a sum of positive squares in 4 ways, for example, as 170569 + 6220036 = 413^2 + 2494^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6390605 - 2⁶ = 6390541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49094 + ... + 49223.

It is an arithmetic number, because the mean of its divisors is an integer number (1032339).

Almost surely, 2^6390605 is an apocalyptic number.

6390605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6390605 is a deficient number, since it is larger than the sum of its proper divisors (1868107).

6390605 is a wasteful number, since it uses less digits than its factorization.

6390605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98335.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 6390605 is about 2527.9645962711. The cubic root of 6390605 is about 185.5726594221.

The spelling of 6390605 in words is "six million, three hundred ninety thousand, six hundred five".