6399018 has 12 divisors (see below), whose sum is σ = 13864578. Its totient is φ = 2133000.

The previous prime is 6399013. The next prime is 6399023. The reversal of 6399018 is 8109936.

6399018 is a `hidden beast` number, since 639 + 9 + 0 + 18 = 666.

It is an interprime number because it is at equal distance from previous prime (6399013) and next prime (6399023).

It can be written as a sum of positive squares in only one way, i.e., 6365529 + 33489 = 2523^2 + 183^2 .

It is not an unprimeable number, because it can be changed into a prime (6399013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177733 + ... + 177768.

Almost surely, 2^6399018 is an apocalyptic number.

6399018 is an abundant number, since it is smaller than the sum of its proper divisors (7465560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6399018 is a wasteful number, since it uses less digits than its factorization.

6399018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355509 (or 355506 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 6399018 is about 2529.6280358978. The cubic root of 6399018 is about 185.6540569416.

The spelling of 6399018 in words is "six million, three hundred ninety-nine thousand, eighteen".