47693809 has 4 divisors (see below), whose sum is σ = 47788020. Its totient is φ = 47599600.

The previous prime is 47693791. The next prime is 47693831. The reversal of 47693809 is 90839674.

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 43296400 + 4397409 = 6580^2 + 2097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47693809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47693839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46342 + ... + 47359.

It is an arithmetic number, because the mean of its divisors is an integer number (11947005).

Almost surely, 2^47693809 is an apocalyptic number.

It is an amenable number.

47693809 is a deficient number, since it is larger than the sum of its proper divisors (94211).

47693809 is an equidigital number, since it uses as much as digits as its factorization.

47693809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94210.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 47693809 is about 6906.0704456297. The cubic root of 47693809 is about 362.6497112885.

The spelling of 47693809 in words is "forty-seven million, six hundred ninety-three thousand, eight hundred nine".