2190730 has 16 divisors (see below), whose sum is σ = 3998664. Its totient is φ = 864000.

The previous prime is 2190691. The next prime is 2190737. The reversal of 2190730 is 370912.

It can be written as a sum of positive squares in 4 ways, for example, as 1841449 + 349281 = 1357^2 + 591^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771 + ... + 2230.

2^2190730 is an apocalyptic number.

2190730 is a deficient number, since it is larger than the sum of its proper divisors (1807934).

2190730 is a wasteful number, since it uses less digits than its factorization.

2190730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 2190730 is about 1480.1114822877. Note that the first 3 decimals coincide. The cubic root of 2190730 is about 129.8762135284.

The spelling of 2190730 in words is "two million, one hundred ninety thousand, seven hundred thirty".