1444535440 has 40 divisors (see below), whose sum is σ = 3361001400. Its totient is φ = 577391616.

The previous prime is 1444535437. The next prime is 1444535453. The reversal of 1444535440 is 445354441.

It can be written as a sum of positive squares in 4 ways, for example, as 179452816 + 1265082624 = 13396^2 + 35568^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1444535396 and 1444535405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118092 + ... + 129748.

It is an arithmetic number, because the mean of its divisors is an integer number (84025035).

Almost surely, 2^1444535440 is an apocalyptic number.

1444535440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1444535440 is an abundant number, since it is smaller than the sum of its proper divisors (1916465960).

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

1444535440 is a wasteful number, since it uses less digits than its factorization.

1444535440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13219 (or 13213 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

The square root of 1444535440 is about 38007.0446101772. The cubic root of 1444535440 is about 1130.4275511603.

Adding to 1444535440 its reverse (445354441), we get a palindrome (1889889881).

The spelling of 1444535440 in words is "one billion, four hundred forty-four million, five hundred thirty-five thousand, four hundred forty".