6859890 has 56 divisors (see below), whose sum is σ = 18532908. Its totient is φ = 1827360.

The previous prime is 6859873. The next prime is 6859901. The reversal of 6859890 is 989586.

It can be written as a sum of positive squares in 2 ways, for example, as 6859161 + 729 = 2619^2 + 27^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6820 + ... + 7760.

Almost surely, 2^6859890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6859890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9266454).

6859890 is an abundant number, since it is smaller than the sum of its proper divisors (11673018).

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

6859890 is an equidigital number, since it uses as much as digits as its factorization.

6859890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 951 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 6859890 is about 2619.1391715600. The cubic root of 6859890 is about 190.0082175578.

The spelling of 6859890 in words is "six million, eight hundred fifty-nine thousand, eight hundred ninety".