47998721 has 8 divisors (see below), whose sum is σ = 48607104. Its totient is φ = 47393280.

The previous prime is 47998697. The next prime is 47998729. The reversal of 47998721 is 12789974.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47998721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47998729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65660 + ... + 66386.

It is an arithmetic number, because the mean of its divisors is an integer number (6075888).

Almost surely, 2^47998721 is an apocalyptic number.

It is an amenable number.

47998721 is a deficient number, since it is larger than the sum of its proper divisors (608383).

47998721 is a wasteful number, since it uses less digits than its factorization.

47998721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471.

The product of its digits is 254016, while the sum is 47.

The square root of 47998721 is about 6928.1109257863. The cubic root of 47998721 is about 363.4208906249.

The spelling of 47998721 in words is "forty-seven million, nine hundred ninety-eight thousand, seven hundred twenty-one".