1440646656 has 80 divisors (see below), whose sum is σ = 3850293744. Its totient is φ = 478674944.

The previous prime is 1440646651. The next prime is 1440646661. The reversal of 1440646656 is 6566460441.

It is an interprime number because it is at equal distance from previous prime (1440646651) and next prime (1440646661).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440646651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540880 + ... + 543536.

Almost surely, 2^1440646656 is an apocalyptic number.

1440646656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1440646656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1925146872).

1440646656 is an abundant number, since it is smaller than the sum of its proper divisors (2409647088).

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

1440646656 is an equidigital number, since it uses as much as digits as its factorization.

1440646656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031 (or 3015 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 1440646656 is about 37955.8514066013. The cubic root of 1440646656 is about 1129.4122445259.

The spelling of 1440646656 in words is "one billion, four hundred forty million, six hundred forty-six thousand, six hundred fifty-six".