923687813 has 4 divisors (see below), whose sum is σ = 924139788. Its totient is φ = 923235840.

The previous prime is 923687767. The next prime is 923687837. The reversal of 923687813 is 318786329.

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 690270529 + 233417284 = 26273^2 + 15278^2 .

It is a cyclic number.

It is not a de Polignac number, because 923687813 - 2²⁴ = 906910597 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 (923684813) 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, 222908 + ... + 227013.

It is an arithmetic number, because the mean of its divisors is an integer number (231034947).

Almost surely, 2^923687813 is an apocalyptic number.

It is an amenable number.

923687813 is a deficient number, since it is larger than the sum of its proper divisors (451975).

923687813 is a wasteful number, since it uses less digits than its factorization.

923687813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451974.

The product of its digits is 435456, while the sum is 47.

The square root of 923687813 is about 30392.2327741810. The cubic root of 923687813 is about 973.8866319822.

The spelling of 923687813 in words is "nine hundred twenty-three million, six hundred eighty-seven thousand, eight hundred thirteen".