2190637 has 4 divisors (see below), whose sum is σ = 2319516. Its totient is φ = 2061760.

The previous prime is 2190613. The next prime is 2190647. The reversal of 2190637 is 7360912.

2190637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1121481 + 1069156 = 1059^2 + 1034^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2190637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190607) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 64414 + ... + 64447.

It is an arithmetic number, because the mean of its divisors is an integer number (579879).

2^2190637 is an apocalyptic number.

It is an amenable number.

2190637 is a deficient number, since it is larger than the sum of its proper divisors (128879).

2190637 is a wasteful number, since it uses less digits than its factorization.

2190637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128878.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 2190637 is about 1480.0800654019. The cubic root of 2190637 is about 129.8743756846.

The spelling of 2190637 in words is "two million, one hundred ninety thousand, six hundred thirty-seven".