47898721 has 4 divisors (see below), whose sum is σ = 51583252. Its totient is φ = 44214192.

The previous prime is 47898713. The next prime is 47898743. The reversal of 47898721 is 12789874.

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 7639696 + 40259025 = 2764^2 + 6345^2 .

It is a cyclic number.

It is not a de Polignac number, because 47898721 - 2³ = 47898713 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47898421) 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, 1842246 + ... + 1842271.

It is an arithmetic number, because the mean of its divisors is an integer number (12895813).

Almost surely, 2^47898721 is an apocalyptic number.

It is an amenable number.

47898721 is a deficient number, since it is larger than the sum of its proper divisors (3684531).

47898721 is a wasteful number, since it uses less digits than its factorization.

47898721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684530.

The product of its digits is 225792, while the sum is 46.

The square root of 47898721 is about 6920.8901884078. The cubic root of 47898721 is about 363.1683328082.

It can be divided in two parts, 478 and 98721, that added together give a palindrome (99199).

The spelling of 47898721 in words is "forty-seven million, eight hundred ninety-eight thousand, seven hundred twenty-one".