2090405 has 8 divisors (see below), whose sum is σ = 2656152. Its totient is φ = 1573888.

The previous prime is 2090381. The next prime is 2090441. The reversal of 2090405 is 5040902.

It can be written as a sum of positive squares in 4 ways, for example, as 113569 + 1976836 = 337^2 + 1406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2090405 - 2²⁰ = 1041829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12212 + ... + 12381.

It is an arithmetic number, because the mean of its divisors is an integer number (332019).

2^2090405 is an apocalyptic number.

It is an amenable number.

2090405 is a deficient number, since it is larger than the sum of its proper divisors (565747).

2090405 is a wasteful number, since it uses less digits than its factorization.

2090405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24615.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2090405 is about 1445.8232948739. The cubic root of 2090405 is about 127.8625844627.

The spelling of 2090405 in words is "two million, ninety thousand, four hundred five".