1340400343220 has 24 divisors (see below), whose sum is σ = 2839750820424. Its totient is φ = 531415356416.

The previous prime is 1340400343151. The next prime is 1340400343231. The reversal of 1340400343220 is 223430040431.

It can be written as a sum of positive squares in 4 ways, for example, as 1387684 + 1340398955536 = 1178^2 + 1157756^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1340400343220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296546489 + ... + 296551008.

It is an arithmetic number, because the mean of its divisors is an integer number (118322950851).

Almost surely, 2^{1340400343220} is an apocalyptic number.

1340400343220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340400343220 is an abundant number, since it is smaller than the sum of its proper divisors (1499350477204).

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

1340400343220 is a wasteful number, since it uses less digits than its factorization.

1340400343220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593097619 (or 593097617 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 1340400343220 its reverse (223430040431), we get a palindrome (1563830383651).

The spelling of 1340400343220 in words is "one trillion, three hundred forty billion, four hundred million, three hundred forty-three thousand, two hundred twenty".