1440621668 has 6 divisors (see below), whose sum is σ = 2521087926. Its totient is φ = 720310832.

The previous prime is 1440621631. The next prime is 1440621671. The reversal of 1440621668 is 8661260441.

It can be written as a sum of positive squares in only one way, i.e., 927689764 + 512931904 = 30458^2 + 22648^2 .

It is a super-2 number, since 2×1440621668² = 4150781580622204448, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180077705 + ... + 180077712.

It is an arithmetic number, because the mean of its divisors is an integer number (420181321).

Almost surely, 2^1440621668 is an apocalyptic number.

It is an amenable number.

1440621668 is a deficient number, since it is larger than the sum of its proper divisors (1080466258).

1440621668 is a wasteful number, since it uses less digits than its factorization.

1440621668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360155421 (or 360155419 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 1440621668 is about 37955.5222332667. The cubic root of 1440621668 is about 1129.4057146073.

The spelling of 1440621668 in words is "one billion, four hundred forty million, six hundred twenty-one thousand, six hundred sixty-eight".