1440449138 has 18 divisors (see below), whose sum is σ = 2211496623. Its totient is φ = 703666140.

The previous prime is 1440449137. The next prime is 1440449177. The reversal of 1440449138 is 8319440441.

It can be written as a sum of positive squares in only one way, i.e., 720224569 + 720224569 = 26837^2 + 26837^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26837.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440449137) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2522393 + ... + 2522963.

Almost surely, 2^1440449138 is an apocalyptic number.

1440449138 is a deficient number, since it is larger than the sum of its proper divisors (771047485).

1440449138 is an frugal number, since it uses more digits than its factorization.

1440449138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238 (or 620 counting only the distinct ones).

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

The square root of 1440449138 is about 37953.2493734068. The cubic root of 1440449138 is about 1129.3606266309.

Adding to 1440449138 its reverse (8319440441), we get a palindrome (9759889579).

The spelling of 1440449138 in words is "one billion, four hundred forty million, four hundred forty-nine thousand, one hundred thirty-eight".