2090639 has 4 divisors (see below), whose sum is σ = 2162760. Its totient is φ = 2018520.

The previous prime is 2090633. The next prime is 2090651. The reversal of 2090639 is 9360902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9360902 = 2 ⋅4680451.

It is a cyclic number.

It is not a de Polignac number, because 2090639 - 2⁴ = 2090623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 72091 = 2090639 / (2 + 0 + 9 + 0 + 6 + 3 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2090633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36017 + ... + 36074.

It is an arithmetic number, because the mean of its divisors is an integer number (540690).

2^2090639 is an apocalyptic number.

2090639 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2090639 is a deficient number, since it is larger than the sum of its proper divisors (72121).

2090639 is an equidigital number, since it uses as much as digits as its factorization.

2090639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72120.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 2090639 is about 1445.9042153614. The cubic root of 2090639 is about 127.8673552653.

The spelling of 2090639 in words is "two million, ninety thousand, six hundred thirty-nine".