813373805 has 16 divisors (see below), whose sum is σ = 986871600. Its totient is φ = 643507200.

The previous prime is 813373787. The next prime is 813373807. The reversal of 813373805 is 508373318.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8743849 + 804629956 = 2957^2 + 28366^2 .

It is not a de Polignac number, because 813373805 - 2⁶ = 813373741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813373807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380981 + ... + 383109.

It is an arithmetic number, because the mean of its divisors is an integer number (61679475).

Almost surely, 2^813373805 is an apocalyptic number.

It is an amenable number.

813373805 is a deficient number, since it is larger than the sum of its proper divisors (173497795).

813373805 is a wasteful number, since it uses less digits than its factorization.

813373805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 813373805 is about 28519.7090623309. The cubic root of 813373805 is about 933.4621808370.

The spelling of 813373805 in words is "eight hundred thirteen million, three hundred seventy-three thousand, eight hundred five".