1143721 has 4 divisors (see below), whose sum is σ = 1193472. Its totient is φ = 1093972.

The previous prime is 1143719. The next prime is 1143749. The reversal of 1143721 is 1273411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1143721 - 2¹ = 1143719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1140721) 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, 24841 + ... + 24886.

It is an arithmetic number, because the mean of its divisors is an integer number (298368).

2^1143721 is an apocalyptic number.

It is an amenable number.

1143721 is a deficient number, since it is larger than the sum of its proper divisors (49751).

1143721 is an equidigital number, since it uses as much as digits as its factorization.

1143721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49750.

The product of its digits is 168, while the sum is 19.

The square root of 1143721 is about 1069.4489235115. The cubic root of 1143721 is about 104.5779277253.

The spelling of 1143721 in words is "one million, one hundred forty-three thousand, seven hundred twenty-one".