1440621672 has 128 divisors (see below), whose sum is σ = 4213693440. Its totient is φ = 401955840.

The previous prime is 1440621671. The next prime is 1440621709. The reversal of 1440621672 is 2761260441.

It is not an unprimeable number, because it can be changed into a prime (1440621671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1474048 + ... + 1475024.

It is an arithmetic number, because the mean of its divisors is an integer number (32919480).

Almost surely, 2^1440621672 is an apocalyptic number.

1440621672 is a gapful number since it is divisible by the number (12) 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 1440621672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2106846720).

1440621672 is an abundant number, since it is smaller than the sum of its proper divisors (2773071768).

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

1440621672 is a wasteful number, since it uses less digits than its factorization.

1440621672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 1440621672 is about 37955.5222859599. The cubic root of 1440621672 is about 1129.4057156526.

The spelling of 1440621672 in words is "one billion, four hundred forty million, six hundred twenty-one thousand, six hundred seventy-two".