2798727409 has 3 divisors (see below), whose sum is σ = 2798780313. Its totient is φ = 2798674506.

The previous prime is 2798727401. The next prime is 2798727419. The reversal of 2798727409 is 9047278972.

It is a happy number.

The square root of 2798727409 is 52903.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2798727409 - 2³ = 2798727401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2798727409.

It is not an unprimeable number, because it can be changed into a prime (2798727401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26452 + ... + 79354.

It is an arithmetic number, because the mean of its divisors is an integer number (932926771).

Almost surely, 2^2798727409 is an apocalyptic number.

2798727409 is the 52903-rd square number.

2798727409 is the 26452-nd centered octagonal number.

It is an amenable number.

2798727409 is a deficient number, since it is larger than the sum of its proper divisors (52904).

2798727409 is an frugal number, since it uses more digits than its factorization.

2798727409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105806 (or 52903 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 55.

The cubic root of 2798727409 is about 1409.2461824135.

The spelling of 2798727409 in words is "two billion, seven hundred ninety-eight million, seven hundred twenty-seven thousand, four hundred nine".