1340442101 has 4 divisors (see below), whose sum is σ = 1344420012. Its totient is φ = 1336464192.

The previous prime is 1340442097. The next prime is 1340442107. The reversal of 1340442101 is 1012440431.

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

It can be written as a sum of positive squares in 2 ways, for example, as 441042001 + 899400100 = 21001^2 + 29990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340442101 - 2² = 1340442097 is a prime.

It is a super-2 number, since 2×1340442101² = 3593570052266588402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340442107) 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, 1988450 + ... + 1989123.

It is an arithmetic number, because the mean of its divisors is an integer number (336105003).

Almost surely, 2^1340442101 is an apocalyptic number.

It is an amenable number.

1340442101 is a deficient number, since it is larger than the sum of its proper divisors (3977911).

1340442101 is an equidigital number, since it uses as much as digits as its factorization.

1340442101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977910.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1340442101 is about 36612.0485769371. The cubic root of 1340442101 is about 1102.5950030826.

Adding to 1340442101 its reverse (1012440431), we get a palindrome (2352882532).

The spelling of 1340442101 in words is "one billion, three hundred forty million, four hundred forty-two thousand, one hundred one".