147712721 has 8 divisors (see below), whose sum is σ = 159169920. Its totient is φ = 136269072.

The previous prime is 147712687. The next prime is 147712723. The reversal of 147712721 is 127217741.

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-147712721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (147712723) 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, 38726 + ... + 42368.

It is an arithmetic number, because the mean of its divisors is an integer number (19896240).

Almost surely, 2^147712721 is an apocalyptic number.

It is an amenable number.

147712721 is a deficient number, since it is larger than the sum of its proper divisors (11457199).

147712721 is a wasteful number, since it uses less digits than its factorization.

147712721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6775.

The product of its digits is 5488, while the sum is 32.

The square root of 147712721 is about 12153.7122312485. The cubic root of 147712721 is about 528.6147771433.

The spelling of 147712721 in words is "one hundred forty-seven million, seven hundred twelve thousand, seven hundred twenty-one".