2817990 has 120 divisors (see below), whose sum is σ = 8938512. Its totient is φ = 635040.

The previous prime is 2817973. The next prime is 2818027. The reversal of 2817990 is 997182.

It is a happy number.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 39655 + ... + 39725.

2^2817990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2817990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4469256).

2817990 is an abundant number, since it is smaller than the sum of its proper divisors (6120522).

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

2817990 is a wasteful number, since it uses less digits than its factorization.

2817990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 2817990 is about 1678.6869869038. The cubic root of 2817990 is about 141.2471897527.

The spelling of 2817990 in words is "two million, eight hundred seventeen thousand, nine hundred ninety".