813420449 has 4 divisors (see below), whose sum is σ = 841469460. Its totient is φ = 785371440.

The previous prime is 813420409. The next prime is 813420451. The reversal of 813420449 is 944024318.

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 569061025 + 244359424 = 23855^2 + 15632^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813420449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813420409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14024462 + ... + 14024519.

It is an arithmetic number, because the mean of its divisors is an integer number (210367365).

Almost surely, 2^813420449 is an apocalyptic number.

It is an amenable number.

813420449 is a deficient number, since it is larger than the sum of its proper divisors (28049011).

813420449 is a wasteful number, since it uses less digits than its factorization.

813420449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28049010.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 813420449 is about 28520.5268008850. The cubic root of 813420449 is about 933.4800240383.

The spelling of 813420449 in words is "eight hundred thirteen million, four hundred twenty thousand, four hundred forty-nine".