2118990 has 64 divisors (see below), whose sum is σ = 5515776. Its totient is φ = 519552.

The previous prime is 2118973. The next prime is 2119031. The reversal of 2118990 is 998112.

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 polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25489 + ... + 25571.

It is an arithmetic number, because the mean of its divisors is an integer number (86184).

2^2118990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2757888).

2118990 is an abundant number, since it is smaller than the sum of its proper divisors (3396786).

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

2118990 is a wasteful number, since it uses less digits than its factorization.

2118990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153.

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

The square root of 2118990 is about 1455.6751011129. The cubic root of 2118990 is about 128.4427619336.

The spelling of 2118990 in words is "two million, one hundred eighteen thousand, nine hundred ninety".