813688398 has 24 divisors (see below), whose sum is σ = 1803993048. Its totient is φ = 264921552.

The previous prime is 813688397. The next prime is 813688417. The reversal of 813688398 is 893886318.

It is a happy number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813688397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 524865 + ... + 526412.

It is an arithmetic number, because the mean of its divisors is an integer number (75166377).

Almost surely, 2^813688398 is an apocalyptic number.

813688398 is an abundant number, since it is smaller than the sum of its proper divisors (990304650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813688398 is a wasteful number, since it uses less digits than its factorization.

813688398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051328 (or 1051325 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 813688398 is about 28525.2238904448. The cubic root of 813688398 is about 933.5825120688.

The spelling of 813688398 in words is "eight hundred thirteen million, six hundred eighty-eight thousand, three hundred ninety-eight".