47808137 has 4 divisors (see below), whose sum is σ = 51485700. Its totient is φ = 44130576.

The previous prime is 47808133. The next prime is 47808139. The reversal of 47808137 is 73180874.

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 19971961 + 27836176 = 4469^2 + 5276^2 .

It is a cyclic number.

It is not a de Polignac number, because 47808137 - 2² = 47808133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47808137.

It is not an unprimeable number, because it can be changed into a prime (47808133) 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, 1838762 + ... + 1838787.

It is an arithmetic number, because the mean of its divisors is an integer number (12871425).

Almost surely, 2^47808137 is an apocalyptic number.

It is an amenable number.

47808137 is a deficient number, since it is larger than the sum of its proper divisors (3677563).

47808137 is a wasteful number, since it uses less digits than its factorization.

47808137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677562.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 47808137 is about 6914.3428465762. The cubic root of 47808137 is about 362.9392522305.

The spelling of 47808137 in words is "forty-seven million, eight hundred eight thousand, one hundred thirty-seven".