1340220402 has 12 divisors (see below), whose sum is σ = 2903810910. Its totient is φ = 446740128.

The previous prime is 1340220391. The next prime is 1340220407. The reversal of 1340220402 is 2040220431.

1340220402 is a `hidden beast` number, since 1 + 3 + 40 + 220 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1340218881 + 1521 = 36609^2 + 39^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 74456689 = 1340220402 / (1 + 3 + 4 + 0 + 2 + 2 + 0 + 4 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (1340220407) 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 5 ways as a sum of consecutive naturals, for example, 37228327 + ... + 37228362.

Almost surely, 2^1340220402 is an apocalyptic number.

1340220402 is an abundant number, since it is smaller than the sum of its proper divisors (1563590508).

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

1340220402 is a wasteful number, since it uses less digits than its factorization.

1340220402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74456697 (or 74456694 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1340220402 is about 36609.0207735744. The cubic root of 1340220402 is about 1102.5342127690.

Adding to 1340220402 its reverse (2040220431), we get a palindrome (3380440833).

The spelling of 1340220402 in words is "one billion, three hundred forty million, two hundred twenty thousand, four hundred two".