47646721 has 4 divisors (see below), whose sum is σ = 49183744. Its totient is φ = 46109700.

The previous prime is 47646719. The next prime is 47646727. The reversal of 47646721 is 12764674.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47646721 - 2¹ = 47646719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47646727) 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, 768465 + ... + 768526.

It is an arithmetic number, because the mean of its divisors is an integer number (12295936).

Almost surely, 2^47646721 is an apocalyptic number.

It is an amenable number.

47646721 is a deficient number, since it is larger than the sum of its proper divisors (1537023).

47646721 is a wasteful number, since it uses less digits than its factorization.

47646721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537022.

The product of its digits is 56448, while the sum is 37.

The square root of 47646721 is about 6902.6604291389. The cubic root of 47646721 is about 362.5303242171.

The spelling of 47646721 in words is "forty-seven million, six hundred forty-six thousand, seven hundred twenty-one".