6390918 has 48 divisors (see below), whose sum is σ = 14826240. Its totient is φ = 1984752.

The previous prime is 6390907. The next prime is 6390947. The reversal of 6390918 is 8190936.

6390918 is a `hidden beast` number, since 639 + 0 + 9 + 18 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17623 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (308880).

Almost surely, 2^6390918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6390918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7413120).

6390918 is an abundant number, since it is smaller than the sum of its proper divisors (8435322).

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

6390918 is a wasteful number, since it uses less digits than its factorization.

6390918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 430 counting only the distinct ones).

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

The square root of 6390918 is about 2528.0265030256. The cubic root of 6390918 is about 185.5756890410.

The spelling of 6390918 in words is "six million, three hundred ninety thousand, nine hundred eighteen".