1340399147 has 4 divisors (see below), whose sum is σ = 1344765576. Its totient is φ = 1336032720.

The previous prime is 1340399143. The next prime is 1340399167. The reversal of 1340399147 is 7419930431.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1340399147 - 2² = 1340399143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340399141) 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 3 ways as a sum of consecutive naturals, for example, 2182754 + ... + 2183367.

It is an arithmetic number, because the mean of its divisors is an integer number (336191394).

Almost surely, 2^1340399147 is an apocalyptic number.

1340399147 is a deficient number, since it is larger than the sum of its proper divisors (4366429).

1340399147 is an equidigital number, since it uses as much as digits as its factorization.

1340399147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366428.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1340399147 is about 36611.4619620687. The cubic root of 1340399147 is about 1102.5832255326.

The spelling of 1340399147 in words is "one billion, three hundred forty million, three hundred ninety-nine thousand, one hundred forty-seven".