2904809409 has 6 divisors (see below), whose sum is σ = 4195835826. Its totient is φ = 1936539600.

The previous prime is 2904809393. The next prime is 2904809417. The reversal of 2904809409 is 9049084092.

It can be written as a sum of positive squares in only one way, i.e., 2904671025 + 138384 = 53895^2 + 372^2 .

It is not a de Polignac number, because 2904809409 - 2⁴ = 2904809393 is a prime.

It is a super-2 number, since 2×2904809409² = 16875835405229858562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2904809309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161378292 + ... + 161378309.

It is an arithmetic number, because the mean of its divisors is an integer number (699305971).

Almost surely, 2^2904809409 is an apocalyptic number.

It is an amenable number.

2904809409 is a deficient number, since it is larger than the sum of its proper divisors (1291026417).

2904809409 is a wasteful number, since it uses less digits than its factorization.

2904809409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322756607 (or 322756604 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 2904809409 is about 53896.2838143781. The cubic root of 2904809409 is about 1426.8310364366.

The spelling of 2904809409 in words is "two billion, nine hundred four million, eight hundred nine thousand, four hundred nine".