1440040020 has 48 divisors (see below), whose sum is σ = 4244331840. Its totient is φ = 363799296.

The previous prime is 1440039967. The next prime is 1440040027. The reversal of 1440040020 is 200400441.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440040027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630457 + ... + 632736.

It is an arithmetic number, because the mean of its divisors is an integer number (88423580).

Almost surely, 2^1440040020 is an apocalyptic number.

1440040020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440040020 is an abundant number, since it is smaller than the sum of its proper divisors (2804291820).

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

1440040020 is a wasteful number, since it uses less digits than its factorization.

1440040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263224 (or 1263222 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1440040020 is about 37947.8592281567. The cubic root of 1440040020 is about 1129.2536957442.

Adding to 1440040020 its reverse (200400441), we get a palindrome (1640440461).

The spelling of 1440040020 in words is "one billion, four hundred forty million, forty thousand, twenty".