1340443020 has 72 divisors (see below), whose sum is σ = 4366023984. Its totient is φ = 306386304.

The previous prime is 1340443019. The next prime is 1340443021. The reversal of 1340443020 is 203440431.

1340443020 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1340443019) and next prime (1340443021).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1340443021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225027 + ... + 230906.

It is an arithmetic number, because the mean of its divisors is an integer number (60639222).

Almost surely, 2^1340443020 is an apocalyptic number.

1340443020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340443020 is an abundant number, since it is smaller than the sum of its proper divisors (3025580964).

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

1340443020 is a wasteful number, since it uses less digits than its factorization.

1340443020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455959 (or 455950 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1340443020 is about 36612.0611274482. The cubic root of 1340443020 is about 1102.5952550603.

Adding to 1340443020 its reverse (203440431), we get a palindrome (1543883451).

The spelling of 1340443020 in words is "one billion, three hundred forty million, four hundred forty-three thousand, twenty".