1173721 has 4 divisors (see below), whose sum is σ = 1185444. Its totient is φ = 1162000.

The previous prime is 1173709. The next prime is 1173743. The reversal of 1173721 is 1273711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1273711 = 101 ⋅12611.

It can be written as a sum of positive squares in 2 ways, for example, as 632025 + 541696 = 795^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1173721 - 2⁷ = 1173593 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1173692 and 1173701.

It is not an unprimeable number, because it can be changed into a prime (1173121) 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 3 ways as a sum of consecutive naturals, for example, 5710 + ... + 5911.

It is an arithmetic number, because the mean of its divisors is an integer number (296361).

2^1173721 is an apocalyptic number.

It is an amenable number.

1173721 is a deficient number, since it is larger than the sum of its proper divisors (11723).

1173721 is a wasteful number, since it uses less digits than its factorization.

1173721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11722.

The product of its digits is 294, while the sum is 22.

The square root of 1173721 is about 1083.3840500949. The cubic root of 1173721 is about 105.4844132915.

The spelling of 1173721 in words is "one million, one hundred seventy-three thousand, seven hundred twenty-one".