1043721 has 12 divisors (see below), whose sum is σ = 1723072. Its totient is φ = 596376.

The previous prime is 1043701. The next prime is 1043723. The reversal of 1043721 is 1273401.

It is not a de Polignac number, because 1043721 - 2⁶ = 1043657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1043694 and 1043703.

It is not an unprimeable number, because it can be changed into a prime (1043723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8221 + ... + 8346.

2^1043721 is an apocalyptic number.

It is an amenable number.

1043721 is a deficient number, since it is larger than the sum of its proper divisors (679351).

1043721 is a wasteful number, since it uses less digits than its factorization.

1043721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16580 (or 16577 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1043721 is about 1021.6266441318. The cubic root of 1043721 is about 101.4366288080.

It can be divided in two parts, 1043 and 721, that added together give a square (1764 = 42²).

The spelling of 1043721 in words is "one million, forty-three thousand, seven hundred twenty-one".