1340220399 has 8 divisors (see below), whose sum is σ = 2042240640. Its totient is φ = 765840216.

The previous prime is 1340220391. The next prime is 1340220407. The reversal of 1340220399 is 9930220431.

It is an interprime number because it is at equal distance from previous prime (1340220391) and next prime (1340220407).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1340220399 - 2³ = 1340220391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340220391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31909989 + ... + 31910030.

It is an arithmetic number, because the mean of its divisors is an integer number (255280080).

Almost surely, 2^1340220399 is an apocalyptic number.

1340220399 is a deficient number, since it is larger than the sum of its proper divisors (702020241).

1340220399 is an equidigital number, since it uses as much as digits as its factorization.

1340220399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63820029.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 1340220399 is about 36609.0207326009. The cubic root of 1340220399 is about 1102.5342119463.

The spelling of 1340220399 in words is "one billion, three hundred forty million, two hundred twenty thousand, three hundred ninety-nine".