2172390 has 64 divisors (see below), whose sum is σ = 5909760. Its totient is φ = 506240.

The previous prime is 2172389. The next prime is 2172397. The reversal of 2172390 is 932712.

It is a self number, because there is not a number n which added to its sum of digits gives 2172390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9457 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (92340).

2^2172390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2172390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2954880).

2172390 is an abundant number, since it is smaller than the sum of its proper divisors (3737370).

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

2172390 is a wasteful number, since it uses less digits than its factorization.

2172390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 2172390 is about 1473.9029818818. The cubic root of 2172390 is about 129.5127718554.

The spelling of 2172390 in words is "two million, one hundred seventy-two thousand, three hundred ninety".