6918990 has 64 divisors (see below), whose sum is σ = 18156096. Its totient is φ = 1677312.

The previous prime is 6918979. The next prime is 6918997. The reversal of 6918990 is 998196.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6918997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43992 + ... + 44148.

It is an arithmetic number, because the mean of its divisors is an integer number (283689).

Almost surely, 2^6918990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6918990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9078048).

6918990 is an abundant number, since it is smaller than the sum of its proper divisors (11237106).

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

6918990 is a wasteful number, since it uses less digits than its factorization.

6918990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 6918990 is about 2630.3973083928. The cubic root of 6918990 is about 190.5523171799.

The spelling of 6918990 in words is "six million, nine hundred eighteen thousand, nine hundred ninety".