1340408143 has 4 divisors (see below), whose sum is σ = 1410955960. Its totient is φ = 1269860328.

The previous prime is 1340408141. The next prime is 1340408183. The reversal of 1340408143 is 3418040431.

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 1340408143 - 2¹ = 1340408141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340408141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35273880 + ... + 35273917.

It is an arithmetic number, because the mean of its divisors is an integer number (352738990).

Almost surely, 2^1340408143 is an apocalyptic number.

1340408143 is a deficient number, since it is larger than the sum of its proper divisors (70547817).

1340408143 is an equidigital number, since it uses as much as digits as its factorization.

1340408143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70547816.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1340408143 is about 36611.5848195622. The cubic root of 1340408143 is about 1102.5856921651.

Adding to 1340408143 its reverse (3418040431), we get a palindrome (4758448574).

The spelling of 1340408143 in words is "one billion, three hundred forty million, four hundred eight thousand, one hundred forty-three".