1044000721 has 9 divisors (see below), whose sum is σ = 1059974811. Its totient is φ = 1028265264.

The previous prime is 1044000709. The next prime is 1044000757. The reversal of 1044000721 is 1270004401.

The square root of 1044000721 is 32311.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 954130321 + 89870400 = 30889^2 + 9480^2 .

It is not a de Polignac number, because 1044000721 - 2⁵ = 1044000689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1044000761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2552365 + ... + 2552773.

It is an arithmetic number, because the mean of its divisors is an integer number (117774979).

Almost surely, 2^1044000721 is an apocalyptic number.

1044000721 is the 32311-st square number.

1044000721 is the 16156-th centered octagonal number.

It is an amenable number.

1044000721 is a deficient number, since it is larger than the sum of its proper divisors (15974090).

1044000721 is an frugal number, since it uses more digits than its factorization.

1044000721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The cubic root of 1044000721 is about 1014.4568979292.

The spelling of 1044000721 in words is "one billion, forty-four million, seven hundred twenty-one", and thus it is an aban number.