47152721 has 8 divisors (see below), whose sum is σ = 58787904. Its totient is φ = 36742320.

The previous prime is 47152711. The next prime is 47152751. The reversal of 47152721 is 12725174.

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

It is a cyclic number.

It is not a de Polignac number, because 47152721 - 2¹⁸ = 46890577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47152711) 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, 306110 + ... + 306263.

It is an arithmetic number, because the mean of its divisors is an integer number (7348488).

Almost surely, 2^47152721 is an apocalyptic number.

It is an amenable number.

47152721 is a deficient number, since it is larger than the sum of its proper divisors (11635183).

47152721 is a wasteful number, since it uses less digits than its factorization.

47152721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612391.

The product of its digits is 3920, while the sum is 29.

The square root of 47152721 is about 6866.7838905852. The cubic root of 47152721 is about 361.2730673361.

Adding to 47152721 its reverse (12725174), we get a palindrome (59877895).

The spelling of 47152721 in words is "forty-seven million, one hundred fifty-two thousand, seven hundred twenty-one".