47997887 has 4 divisors (see below), whose sum is σ = 54854736. Its totient is φ = 41141040.

The previous prime is 47997869. The next prime is 47997923. The reversal of 47997887 is 78879974.

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

It is a cyclic number.

It is not a de Polignac number, because 47997887 - 2²⁰ = 46949311 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 (47997487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3428414 + ... + 3428427.

It is an arithmetic number, because the mean of its divisors is an integer number (13713684).

Almost surely, 2^47997887 is an apocalyptic number.

47997887 is a deficient number, since it is larger than the sum of its proper divisors (6856849).

47997887 is an equidigital number, since it uses as much as digits as its factorization.

47997887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856848.

The product of its digits is 7112448, while the sum is 59.

The square root of 47997887 is about 6928.0507359574. The cubic root of 47997887 is about 363.4187857440.

It can be divided in two parts, 47997 and 887, that added together give a palindrome (48884).

The spelling of 47997887 in words is "forty-seven million, nine hundred ninety-seven thousand, eight hundred eighty-seven".