13081998 has 8 divisors (see below), whose sum is σ = 26164008. Its totient is φ = 4360664.

The previous prime is 13081997. The next prime is 13082023. The reversal of 13081998 is 89918031.

It is a happy number.

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

13081998 is an admirable number.

It is a super-2 number, since 2×13081998² = 342277343344008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13081997) 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, 1090161 + ... + 1090172.

It is an arithmetic number, because the mean of its divisors is an integer number (3270501).

Almost surely, 2^13081998 is an apocalyptic number.

13081998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13081998 is a wasteful number, since it uses less digits than its factorization.

13081998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180338.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 13081998 is about 3616.9044775885. The cubic root of 13081998 is about 235.6268041101.

It can be divided in two parts, 130 and 81998, that added together give a palindrome (82128).

The spelling of 13081998 in words is "thirteen million, eighty-one thousand, nine hundred ninety-eight".