1045643444 has 12 divisors (see below), whose sum is σ = 1831408068. Its totient is φ = 522384000.

The previous prime is 1045643387. The next prime is 1045643449. The reversal of 1045643444 is 4443465401.

It can be written as a sum of positive squares in 2 ways, for example, as 164147344 + 881496100 = 12812^2 + 29690^2 .

It is a super-2 number, since 2×1045643444² = 2186740423960362272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045643449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104027 + ... + 113634.

It is an arithmetic number, because the mean of its divisors is an integer number (152617339).

Almost surely, 2^1045643444 is an apocalyptic number.

It is an amenable number.

1045643444 is a deficient number, since it is larger than the sum of its proper divisors (785764624).

1045643444 is a wasteful number, since it uses less digits than its factorization.

1045643444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218866 (or 218864 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

The square root of 1045643444 is about 32336.4104996210. The cubic root of 1045643444 is about 1014.9886978123.

The spelling of 1045643444 in words is "one billion, forty-five million, six hundred forty-three thousand, four hundred forty-four".