47452809 has 4 divisors (see below), whose sum is σ = 63270416. Its totient is φ = 31635204.

The previous prime is 47452799. The next prime is 47452813. The reversal of 47452809 is 90825474.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 47452809 - 2⁵ = 47452777 is a prime.

It is a super-3 number, since 3×47452809³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47452819) 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, 7908799 + ... + 7908804.

It is an arithmetic number, because the mean of its divisors is an integer number (15817604).

Almost surely, 2^47452809 is an apocalyptic number.

It is an amenable number.

47452809 is a deficient number, since it is larger than the sum of its proper divisors (15817607).

47452809 is a wasteful number, since it uses less digits than its factorization.

47452809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15817606.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 47452809 is about 6888.5999303197. The cubic root of 47452809 is about 362.0378484688.

The spelling of 47452809 in words is "forty-seven million, four hundred fifty-two thousand, eight hundred nine".