2479638409 has 4 divisors (see below), whose sum is σ = 2492225604. Its totient is φ = 2467051216.

The previous prime is 2479638397. The next prime is 2479638431. The reversal of 2479638409 is 9048369742.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1670520384 + 809118025 = 40872^2 + 28445^2 .

It is a cyclic number.

It is not a de Polignac number, because 2479638409 - 2⁷ = 2479638281 is a prime.

It is a super-2 number, since 2×2479638409² = 12297213278776102562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2479630409) 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, 6293302 + ... + 6293695.

It is an arithmetic number, because the mean of its divisors is an integer number (623056401).

Almost surely, 2^2479638409 is an apocalyptic number.

It is an amenable number.

2479638409 is a deficient number, since it is larger than the sum of its proper divisors (12587195).

2479638409 is a wasteful number, since it uses less digits than its factorization.

2479638409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12587194.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 2479638409 is about 49795.9677986080. The cubic root of 2479638409 is about 1353.5141019677.

The spelling of 2479638409 in words is "two billion, four hundred seventy-nine million, six hundred thirty-eight thousand, four hundred nine".