47791997 has 16 divisors (see below), whose sum is σ = 53851392. Its totient is φ = 42040320.

The previous prime is 47791967. The next prime is 47792027. The reversal of 47791997 is 79919774.

It is an interprime number because it is at equal distance from previous prime (47791967) and next prime (47792027).

It is a cyclic number.

It is not a de Polignac number, because 47791997 - 2⁸ = 47791741 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 (47791927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49673 + ... + 50625.

It is an arithmetic number, because the mean of its divisors is an integer number (3365712).

Almost surely, 2^47791997 is an apocalyptic number.

47791997 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

47791997 is a deficient number, since it is larger than the sum of its proper divisors (6059395).

47791997 is a wasteful number, since it uses less digits than its factorization.

47791997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108.

The product of its digits is 1000188, while the sum is 53.

The square root of 47791997 is about 6913.1756089369. The cubic root of 47791997 is about 362.8984049381.

It can be divided in two parts, 4779 and 1997, that added together give a palindrome (6776).

The spelling of 47791997 in words is "forty-seven million, seven hundred ninety-one thousand, nine hundred ninety-seven".