1167721 has 8 divisors (see below), whose sum is σ = 1260000. Its totient is φ = 1078560.

The previous prime is 1167709. The next prime is 1167731. The reversal of 1167721 is 1277611.

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 1167721 - 2⁵ = 1167689 is a prime.

It is a Duffinian number.

1167721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1167701) 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, 30 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (157500).

2^1167721 is an apocalyptic number.

It is an amenable number.

1167721 is a deficient number, since it is larger than the sum of its proper divisors (92279).

1167721 is a wasteful number, since it uses less digits than its factorization.

1167721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559.

The product of its digits is 588, while the sum is 25.

The square root of 1167721 is about 1080.6114010133. The cubic root of 1167721 is about 105.3043625484.

The spelling of 1167721 in words is "one million, one hundred sixty-seven thousand, seven hundred twenty-one".