1147721 has 8 divisors (see below), whose sum is σ = 1225224. Its totient is φ = 1071360.

The previous prime is 1147717. The next prime is 1147739. The reversal of 1147721 is 1277411.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 1092025 = 236^2 + 1045^2 .

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 1147721 - 2² = 1147717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1147711) 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, 2891 + ... + 3263.

It is an arithmetic number, because the mean of its divisors is an integer number (153153).

2^1147721 is an apocalyptic number.

It is an amenable number.

1147721 is a deficient number, since it is larger than the sum of its proper divisors (77503).

1147721 is a wasteful number, since it uses less digits than its factorization.

1147721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571.

The product of its digits is 392, while the sum is 23.

The square root of 1147721 is about 1071.3174132814. The cubic root of 1147721 is about 104.6997013031.

The spelling of 1147721 in words is "one million, one hundred forty-seven thousand, seven hundred twenty-one".