1340252653 has 4 divisors (see below), whose sum is σ = 1342014588. Its totient is φ = 1338490720.

The previous prime is 1340252651. The next prime is 1340252671. The reversal of 1340252653 is 3562520431.

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: 3562520431 = 103 ⋅34587577.

It can be written as a sum of positive squares in 2 ways, for example, as 365689129 + 974563524 = 19123^2 + 31218^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340252653 - 2¹ = 1340252651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340252651) 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, 879826 + ... + 881347.

It is an arithmetic number, because the mean of its divisors is an integer number (335503647).

Almost surely, 2^1340252653 is an apocalyptic number.

It is an amenable number.

1340252653 is a deficient number, since it is larger than the sum of its proper divisors (1761935).

1340252653 is an equidigital number, since it uses as much as digits as its factorization.

1340252653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761934.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 1340252653 is about 36609.4612497917. The cubic root of 1340252653 is about 1102.5430564750.

The spelling of 1340252653 in words is "one billion, three hundred forty million, two hundred fifty-two thousand, six hundred fifty-three".