813440345 has 4 divisors (see below), whose sum is σ = 976128420. Its totient is φ = 650752272.

The previous prime is 813440339. The next prime is 813440413. The reversal of 813440345 is 543044318.

813440345 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

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 247999504 + 565440841 = 15748^2 + 23779^2 .

It is a cyclic number.

It is not a de Polignac number, because 813440345 - 2⁶ = 813440281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81344030 + ... + 81344039.

It is an arithmetic number, because the mean of its divisors is an integer number (244032105).

Almost surely, 2^813440345 is an apocalyptic number.

It is an amenable number.

813440345 is a deficient number, since it is larger than the sum of its proper divisors (162688075).

813440345 is a wasteful number, since it uses less digits than its factorization.

813440345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162688074.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 813440345 is about 28520.8756001635. The cubic root of 813440345 is about 933.4876348490.

The spelling of 813440345 in words is "eight hundred thirteen million, four hundred forty thousand, three hundred forty-five".