1320042440 has 32 divisors (see below), whose sum is σ = 3018791160. Its totient is φ = 519360000.

The previous prime is 1320042439. The next prime is 1320042443. The reversal of 1320042440 is 442400231.

It can be written as a sum of positive squares in 4 ways, for example, as 968329924 + 351712516 = 31118^2 + 18754^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1320042443) 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, 268061 + ... + 272940.

Almost surely, 2^1320042440 is an apocalyptic number.

1320042440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320042440 is an abundant number, since it is smaller than the sum of its proper divisors (1698748720).

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

1320042440 is a wasteful number, since it uses less digits than its factorization.

1320042440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541073 (or 541069 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1320042440 is about 36332.3883057528. The cubic root of 1320042440 is about 1096.9730666833.

Adding to 1320042440 its reverse (442400231), we get a palindrome (1762442671).

The spelling of 1320042440 in words is "one billion, three hundred twenty million, forty-two thousand, four hundred forty".