1440346889 has 8 divisors (see below), whose sum is σ = 1531787040. Its totient is φ = 1350470016.

The previous prime is 1440346883. The next prime is 1440346907. The reversal of 1440346889 is 9886430441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440346889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440346883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388919 + ... + 392604.

It is an arithmetic number, because the mean of its divisors is an integer number (191473380).

Almost surely, 2^1440346889 is an apocalyptic number.

1440346889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1440346889 is a deficient number, since it is larger than the sum of its proper divisors (91440151).

1440346889 is an equidigital number, since it uses as much as digits as its factorization.

1440346889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781639.

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 1440346889 is about 37951.9023106879. The cubic root of 1440346889 is about 1129.3339037790. Note that the first 3 decimals are identical.

The spelling of 1440346889 in words is "one billion, four hundred forty million, three hundred forty-six thousand, eight hundred eighty-nine".