1040721 has 24 divisors (see below), whose sum is σ = 1583232. Its totient is φ = 607200.

The previous prime is 1040717. The next prime is 1040731. The reversal of 1040721 is 1270401.

It is not a de Polignac number, because 1040721 - 2² = 1040717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1040721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040731) 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 23 ways as a sum of consecutive naturals, for example, 17031 + ... + 17091.

It is an arithmetic number, because the mean of its divisors is an integer number (65968).

2^1040721 is an apocalyptic number.

1040721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1040721 is a deficient number, since it is larger than the sum of its proper divisors (542511).

1040721 is a wasteful number, since it uses less digits than its factorization.

1040721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1040721 is about 1020.1573408058. The cubic root of 1040721 is about 101.3393480483.

The spelling of 1040721 in words is "one million, forty thousand, seven hundred twenty-one".