1340142641 has 4 divisors (see below), whose sum is σ = 1342403172. Its totient is φ = 1337882112.

The previous prime is 1340142619. The next prime is 1340142647. The reversal of 1340142641 is 1462410431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1462410431 = 17 ⋅86024143.

It can be written as a sum of positive squares in 2 ways, for example, as 675792016 + 664350625 = 25996^2 + 25775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340142641 - 2¹⁰ = 1340141617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340142641.

It is not an unprimeable number, because it can be changed into a prime (1340142647) 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, 1129376 + ... + 1130561.

It is an arithmetic number, because the mean of its divisors is an integer number (335600793).

Almost surely, 2^1340142641 is an apocalyptic number.

It is an amenable number.

1340142641 is a deficient number, since it is larger than the sum of its proper divisors (2260531).

1340142641 is an equidigital number, since it uses as much as digits as its factorization.

1340142641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260530.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1340142641 is about 36607.9587111874. The cubic root of 1340142641 is about 1102.5128889576.

The spelling of 1340142641 in words is "one billion, three hundred forty million, one hundred forty-two thousand, six hundred forty-one".