1440535144 has 16 divisors (see below), whose sum is σ = 2707812900. Its totient is φ = 718451712.

The previous prime is 1440535139. The next prime is 1440535181. The reversal of 1440535144 is 4415350441.

It can be written as a sum of positive squares in 2 ways, for example, as 1431714244 + 8820900 = 37838^2 + 2970^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223609 + ... + 229960.

Almost surely, 2^1440535144 is an apocalyptic number.

It is an amenable number.

1440535144 is a deficient number, since it is larger than the sum of its proper divisors (1267277756).

1440535144 is a wasteful number, since it uses less digits than its factorization.

1440535144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453972 (or 453968 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 1440535144 is about 37954.3824083596. The cubic root of 1440535144 is about 1129.3831033836.

Adding to 1440535144 its reverse (4415350441), we get a palindrome (5855885585).

The spelling of 1440535144 in words is "one billion, four hundred forty million, five hundred thirty-five thousand, one hundred forty-four".