1345423637 has 4 divisors (see below), whose sum is σ = 1381786476. Its totient is φ = 1309060800.

The previous prime is 1345423633. The next prime is 1345423693. The reversal of 1345423637 is 7363245431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7363245431 = 12917 ⋅570043.

It can be written as a sum of positive squares in 2 ways, for example, as 718722481 + 626701156 = 26809^2 + 25034^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345423637 - 2² = 1345423633 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 1345423637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345423633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18181364 + ... + 18181437.

It is an arithmetic number, because the mean of its divisors is an integer number (345446619).

Almost surely, 2^1345423637 is an apocalyptic number.

It is an amenable number.

1345423637 is a deficient number, since it is larger than the sum of its proper divisors (36362839).

1345423637 is an equidigital number, since it uses as much as digits as its factorization.

1345423637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36362838.

The product of its digits is 181440, while the sum is 38.

The square root of 1345423637 is about 36680.0168620463. The cubic root of 1345423637 is about 1103.9591864791.

The spelling of 1345423637 in words is "one billion, three hundred forty-five million, four hundred twenty-three thousand, six hundred thirty-seven".