1340444220 has 48 divisors (see below), whose sum is σ = 3974025888. Its totient is φ = 336424960.

The previous prime is 1340444207. The next prime is 1340444221. The reversal of 1340444220 is 224440431.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340444221) 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, 656061 + ... + 658100.

It is an arithmetic number, because the mean of its divisors is an integer number (82792206).

Almost surely, 2^1340444220 is an apocalyptic number.

1340444220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340444220 is an abundant number, since it is smaller than the sum of its proper divisors (2633581668).

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

1340444220 is a wasteful number, since it uses less digits than its factorization.

1340444220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314190 (or 1314188 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 1340444220 is about 36612.0775154866. The cubic root of 1340444220 is about 1102.5955840843.

Adding to 1340444220 its reverse (224440431), we get a palindrome (1564884651).

The spelling of 1340444220 in words is "one billion, three hundred forty million, four hundred forty-four thousand, two hundred twenty".