1440423680 has 108 divisors (see below), whose sum is σ = 3568198536. Its totient is φ = 557107200.

The previous prime is 1440423671. The next prime is 1440423689. The reversal of 1440423680 is 863240441.

It is an interprime number because it is at equal distance from previous prime (1440423671) and next prime (1440423689).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440423689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1229495 + ... + 1230665.

Almost surely, 2^1440423680 is an apocalyptic number.

1440423680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1440423680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784099268).

1440423680 is an abundant number, since it is smaller than the sum of its proper divisors (2127774856).

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

1440423680 is an equidigital number, since it uses as much as digits as its factorization.

1440423680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 1440423680 is about 37952.9139856217. The cubic root of 1440423680 is about 1129.3539732820.

The spelling of 1440423680 in words is "one billion, four hundred forty million, four hundred twenty-three thousand, six hundred eighty".