813694987 has 8 divisors (see below), whose sum is σ = 984639456. Its totient is φ = 656426112.

The previous prime is 813694951. The next prime is 813695039. The reversal of 813694987 is 789496318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813694987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (813694927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3418768 + ... + 3419005.

It is an arithmetic number, because the mean of its divisors is an integer number (123079932).

Almost surely, 2^813694987 is an apocalyptic number.

813694987 is a deficient number, since it is larger than the sum of its proper divisors (170944469).

813694987 is a wasteful number, since it uses less digits than its factorization.

813694987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837797.

The product of its digits is 2612736, while the sum is 55.

The square root of 813694987 is about 28525.3393844841. The cubic root of 813694987 is about 933.5850320173.

The spelling of 813694987 in words is "eight hundred thirteen million, six hundred ninety-four thousand, nine hundred eighty-seven".