47879809 has 4 divisors (see below), whose sum is σ = 48201300. Its totient is φ = 47558320.

The previous prime is 47879807. The next prime is 47879827. The reversal of 47879809 is 90897874.

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 28387584 + 19492225 = 5328^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 47879809 - 2¹ = 47879807 is a prime.

It is a super-2 number, since 2×47879809² = 4584952219752962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47879807) 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, 160522 + ... + 160819.

It is an arithmetic number, because the mean of its divisors is an integer number (12050325).

Almost surely, 2^47879809 is an apocalyptic number.

It is an amenable number.

47879809 is a deficient number, since it is larger than the sum of its proper divisors (321491).

47879809 is a wasteful number, since it uses less digits than its factorization.

47879809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321490.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 47879809 is about 6919.5237552884. The cubic root of 47879809 is about 363.1205295579.

The spelling of 47879809 in words is "forty-seven million, eight hundred seventy-nine thousand, eight hundred nine".