6831990 has 96 divisors (see below), whose sum is σ = 19858176. Its totient is φ = 1615680.

The previous prime is 6831971. The next prime is 6831991. The reversal of 6831990 is 991386.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6831991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66279 + ... + 66381.

It is an arithmetic number, because the mean of its divisors is an integer number (206856).

Almost surely, 2^6831990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6831990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9929088).

6831990 is an abundant number, since it is smaller than the sum of its proper divisors (13026186).

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

6831990 is a wasteful number, since it uses less digits than its factorization.

6831990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 191 counting only the distinct ones).

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

The square root of 6831990 is about 2613.8075675153. The cubic root of 6831990 is about 189.7502720968.

The spelling of 6831990 in words is "six million, eight hundred thirty-one thousand, nine hundred ninety".