1340205720 has 64 divisors (see below), whose sum is σ = 4594993920. Its totient is φ = 306332544.

The previous prime is 1340205707. The next prime is 1340205721. The reversal of 1340205720 is 275020431.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340205721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 796902 + ... + 798581.

It is an arithmetic number, because the mean of its divisors is an integer number (71796780).

Almost surely, 2^1340205720 is an apocalyptic number.

1340205720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340205720 is an abundant number, since it is smaller than the sum of its proper divisors (3254788200).

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

1340205720 is a wasteful number, since it uses less digits than its factorization.

1340205720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595504 (or 1595500 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 1340205720 is about 36608.8202486778. The cubic root of 1340205720 is about 1102.5301866982.

The spelling of 1340205720 in words is "one billion, three hundred forty million, two hundred five thousand, seven hundred twenty".