813989994 has 16 divisors (see below), whose sum is σ = 1628434368. Its totient is φ = 271254272.

The previous prime is 813989989. The next prime is 813989999. The reversal of 813989994 is 499989318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (813989989) and next prime (813989999).

It is not an unprimeable number, because it can be changed into a prime (813989999) 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, 7114 + ... + 40970.

It is an arithmetic number, because the mean of its divisors is an integer number (101777148).

Almost surely, 2^813989994 is an apocalyptic number.

813989994 is an abundant number, since it is smaller than the sum of its proper divisors (814444374).

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

813989994 is a wasteful number, since it uses less digits than its factorization.

813989994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37869.

The product of its digits is 5038848, while the sum is 60.

The square root of 813989994 is about 28530.5098797761. The cubic root of 813989994 is about 933.6978428562.

The spelling of 813989994 in words is "eight hundred thirteen million, nine hundred eighty-nine thousand, nine hundred ninety-four".