2190239 has 4 divisors (see below), whose sum is σ = 2198424. Its totient is φ = 2182056.

The previous prime is 2190233. The next prime is 2190269. The reversal of 2190239 is 9320912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2190239 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 (2190233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3677 + ... + 4230.

It is an arithmetic number, because the mean of its divisors is an integer number (549606).

2^2190239 is an apocalyptic number.

2190239 is a deficient number, since it is larger than the sum of its proper divisors (8185).

2190239 is an equidigital number, since it uses as much as digits as its factorization.

2190239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 2190239 is about 1479.9456071086. The cubic root of 2190239 is about 129.8665099159.

The spelling of 2190239 in words is "two million, one hundred ninety thousand, two hundred thirty-nine".