1043721644 has 24 divisors (see below), whose sum is σ = 2090638368. Its totient is φ = 446624640.

The previous prime is 1043721619. The next prime is 1043721673. The reversal of 1043721644 is 4461273401.

It is a self number, because there is not a number n which added to its sum of digits gives 1043721644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9689 + ... + 46704.

It is an arithmetic number, because the mean of its divisors is an integer number (87109932).

Almost surely, 2^1043721644 is an apocalyptic number.

1043721644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1043721644 is an abundant number, since it is smaller than the sum of its proper divisors (1046916724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1043721644 is a wasteful number, since it uses less digits than its factorization.

1043721644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57065 (or 57063 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 1043721644 is about 32306.6811046879. The cubic root of 1043721644 is about 1014.3664967087.

The spelling of 1043721644 in words is "one billion, forty-three million, seven hundred twenty-one thousand, six hundred forty-four".