1172721 has 8 divisors (see below), whose sum is σ = 1705824. Its totient is φ = 710720.

The previous prime is 1172713. The next prime is 1172749. The reversal of 1172721 is 1272711.

It is a happy number.

1172721 is nontrivially palindromic in base 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 1172721 - 2³ = 1172713 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17736 + ... + 17801.

It is an arithmetic number, because the mean of its divisors is an integer number (213228).

2^1172721 is an apocalyptic number.

1172721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1172721 is a deficient number, since it is larger than the sum of its proper divisors (533103).

1172721 is a wasteful number, since it uses less digits than its factorization.

1172721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35551.

The product of its digits is 196, while the sum is 21.

The square root of 1172721 is about 1082.9224348955. The cubic root of 1172721 is about 105.4544475146.

The spelling of 1172721 in words is "one million, one hundred seventy-two thousand, seven hundred twenty-one".