47372721 has 8 divisors (see below), whose sum is σ = 68905824. Its totient is φ = 28710720.

The previous prime is 47372701. The next prime is 47372749. The reversal of 47372721 is 12727374.

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

It is not a de Polignac number, because 47372721 - 2⁶ = 47372657 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1435537 = 47372721 / (4 + 7 + 3 + 7 + 2 + 7 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (47372701) 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, 717736 + ... + 717801.

It is an arithmetic number, because the mean of its divisors is an integer number (8613228).

Almost surely, 2^47372721 is an apocalyptic number.

It is an amenable number.

47372721 is a deficient number, since it is larger than the sum of its proper divisors (21533103).

47372721 is a wasteful number, since it uses less digits than its factorization.

47372721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435551.

The product of its digits is 16464, while the sum is 33.

The square root of 47372721 is about 6882.7843929619. The cubic root of 47372721 is about 361.8340585347.

The spelling of 47372721 in words is "forty-seven million, three hundred seventy-two thousand, seven hundred twenty-one".