2605890839 has 4 divisors (see below), whose sum is σ = 2606770920. Its totient is φ = 2605010760.

The previous prime is 2605890811. The next prime is 2605890841. The reversal of 2605890839 is 9380985062.

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

It is a cyclic number.

It is not a de Polignac number, because 2605890839 - 2²⁴ = 2589113623 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 (2605890899) 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, 435584 + ... + 441525.

It is an arithmetic number, because the mean of its divisors is an integer number (651692730).

Almost surely, 2^2605890839 is an apocalyptic number.

2605890839 is a deficient number, since it is larger than the sum of its proper divisors (880081).

2605890839 is an equidigital number, since it uses as much as digits as its factorization.

2605890839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880080.

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 2605890839 is about 51047.9268824896. The cubic root of 2605890839 is about 1376.1065849402.

The spelling of 2605890839 in words is "two billion, six hundred five million, eight hundred ninety thousand, eight hundred thirty-nine".