1340243053 has 4 divisors (see below), whose sum is σ = 1350474048. Its totient is φ = 1330012060.

The previous prime is 1340243041. The next prime is 1340243063. The reversal of 1340243053 is 3503420431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340243053 is a prime.

It is a super-2 number, since 2×1340243053² = 3592502882229521618, 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 (1340243063) 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, 5115301 + ... + 5115562.

It is an arithmetic number, because the mean of its divisors is an integer number (337618512).

Almost surely, 2^1340243053 is an apocalyptic number.

It is an amenable number.

1340243053 is a deficient number, since it is larger than the sum of its proper divisors (10230995).

1340243053 is a wasteful number, since it uses less digits than its factorization.

1340243053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10230994.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 1340243053 is about 36609.3301359093. The cubic root of 1340243053 is about 1102.5404240264.

Adding to 1340243053 its reverse (3503420431), we get a palindrome (4843663484).

The spelling of 1340243053 in words is "one billion, three hundred forty million, two hundred forty-three thousand, fifty-three".