47992809 has 8 divisors (see below), whose sum is σ = 64577920. Its totient is φ = 31701456.

The previous prime is 47992801. The next prime is 47992831. The reversal of 47992809 is 90829974.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 47992809 - 2³ = 47992801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47992801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73057 + ... + 73710.

It is an arithmetic number, because the mean of its divisors is an integer number (8072240).

Almost surely, 2^47992809 is an apocalyptic number.

It is an amenable number.

47992809 is a deficient number, since it is larger than the sum of its proper divisors (16585111).

47992809 is a wasteful number, since it uses less digits than its factorization.

47992809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146879.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 47992809 is about 6927.6842451139. The cubic root of 47992809 is about 363.4059691681.

The spelling of 47992809 in words is "forty-seven million, nine hundred ninety-two thousand, eight hundred nine".