2163390 has 32 divisors (see below), whose sum is σ = 5335200. Its totient is φ = 561024.

The previous prime is 2163361. The next prime is 2163401. The reversal of 2163390 is 933612.

It is a self number, because there is not a number n which added to its sum of digits gives 2163390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (166725).

2^2163390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2163390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667600).

2163390 is an abundant number, since it is smaller than the sum of its proper divisors (3171810).

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

2163390 is a wasteful number, since it uses less digits than its factorization.

2163390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 2163390 is about 1470.8466949346. The cubic root of 2163390 is about 129.3336713658. Note that the first 3 decimals are identical.

The spelling of 2163390 in words is "two million, one hundred sixty-three thousand, three hundred ninety".