47839681 has 4 divisors (see below), whose sum is σ = 47861892. Its totient is φ = 47817472.

The previous prime is 47839657. The next prime is 47839697. The reversal of 47839681 is 18693874.

It is a happy number.

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 43362225 + 4477456 = 6585^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 47839681 - 2⁷ = 47839553 is a prime.

It is a super-2 number, since 2×47839681² = 4577270156363522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47839621) 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, 7480 + ... + 12313.

It is an arithmetic number, because the mean of its divisors is an integer number (11965473).

Almost surely, 2^47839681 is an apocalyptic number.

It is an amenable number.

47839681 is a deficient number, since it is larger than the sum of its proper divisors (22211).

47839681 is a wasteful number, since it uses less digits than its factorization.

47839681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22210.

The product of its digits is 290304, while the sum is 46.

The square root of 47839681 is about 6916.6235259699. The cubic root of 47839681 is about 363.0190576045.

The spelling of 47839681 in words is "forty-seven million, eight hundred thirty-nine thousand, six hundred eighty-one".