2811990 has 32 divisors (see below), whose sum is σ = 6854400. Its totient is φ = 738144.

The previous prime is 2811989. The next prime is 2812001. The reversal of 2811990 is 991182.

2811990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1311 + ... + 2709.

It is an arithmetic number, because the mean of its divisors is an integer number (214200).

2^2811990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2811990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3427200).

2811990 is an abundant number, since it is smaller than the sum of its proper divisors (4042410).

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

2811990 is a wasteful number, since it uses less digits than its factorization.

2811990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2811990 is about 1676.8989236087. The cubic root of 2811990 is about 141.1468717564.

The spelling of 2811990 in words is "two million, eight hundred eleven thousand, nine hundred ninety".