47791999 has 4 divisors (see below), whose sum is σ = 49869936. Its totient is φ = 45714064.

The previous prime is 47791967. The next prime is 47792027. The reversal of 47791999 is 99919774.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 47791999 - 2⁵ = 47791967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47798999) 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, 1038934 + ... + 1038979.

It is an arithmetic number, because the mean of its divisors is an integer number (12467484).

Almost surely, 2^47791999 is an apocalyptic number.

47791999 is a deficient number, since it is larger than the sum of its proper divisors (2077937).

47791999 is a wasteful number, since it uses less digits than its factorization.

47791999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077936.

The product of its digits is 1285956, while the sum is 55.

The square root of 47791999 is about 6913.1757535882. The cubic root of 47791999 is about 362.8984100003.

The spelling of 47791999 in words is "forty-seven million, seven hundred ninety-one thousand, nine hundred ninety-nine".