1440324140 has 24 divisors (see below), whose sum is σ = 3027635520. Its totient is φ = 575566848.

The previous prime is 1440324073. The next prime is 1440324143. The reversal of 1440324140 is 414230441.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1440324143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13877 + ... + 55436.

It is an arithmetic number, because the mean of its divisors is an integer number (126151480).

Almost surely, 2^1440324140 is an apocalyptic number.

1440324140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440324140 is an abundant number, since it is smaller than the sum of its proper divisors (1587311380).

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

1440324140 is a wasteful number, since it uses less digits than its factorization.

1440324140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70361 (or 70359 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1440324140 is about 37951.6026012078. The cubic root of 1440324140 is about 1129.3279581390.

Adding to 1440324140 its reverse (414230441), we get a palindrome (1854554581).

The spelling of 1440324140 in words is "one billion, four hundred forty million, three hundred twenty-four thousand, one hundred forty".