6390045 has 24 divisors (see below), whose sum is σ = 11729016. Its totient is φ = 3207168.

The previous prime is 6390031. The next prime is 6390047. The reversal of 6390045 is 5400936.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1750329 + 4639716 = 1323^2 + 2154^2 .

It is not a de Polignac number, because 6390045 - 2⁴ = 6390029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390047) 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, 3412 + ... + 4941.

It is an arithmetic number, because the mean of its divisors is an integer number (488709).

Almost surely, 2^6390045 is an apocalyptic number.

It is an amenable number.

6390045 is a deficient number, since it is larger than the sum of its proper divisors (5338971).

6390045 is a wasteful number, since it uses less digits than its factorization.

6390045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8381 (or 8378 counting only the distinct ones).

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

The square root of 6390045 is about 2527.8538327997. The cubic root of 6390045 is about 185.5672387707.

The spelling of 6390045 in words is "six million, three hundred ninety thousand, forty-five".