1043604721 has 16 divisors (see below), whose sum is σ = 1138983120. Its totient is φ = 955503360.

The previous prime is 1043604719. The next prime is 1043604767. The reversal of 1043604721 is 1274063401.

1043604721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 78570496 + 965034225 = 8864^2 + 31065^2 .

It is not a de Polignac number, because 1043604721 - 2¹ = 1043604719 is a prime.

It is a super-2 number, since 2×1043604721² = 2178221627386975682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1043604721.

It is not an unprimeable number, because it can be changed into a prime (1043604421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178911 + ... + 184651.

It is an arithmetic number, because the mean of its divisors is an integer number (71186445).

Almost surely, 2^1043604721 is an apocalyptic number.

It is an amenable number.

1043604721 is a deficient number, since it is larger than the sum of its proper divisors (95378399).

1043604721 is an frugal number, since it uses more digits than its factorization.

1043604721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5829 (or 5795 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1043604721 is about 32304.8714747482. The cubic root of 1043604721 is about 1014.3286171318.

The spelling of 1043604721 in words is "one billion, forty-three million, six hundred four thousand, seven hundred twenty-one".