13897818 has 60 divisors (see below), whose sum is σ = 34278090. Its totient is φ = 4205520.

The previous prime is 13897787. The next prime is 13897831. The reversal of 13897818 is 81879831.

It can be written as a sum of positive squares in only one way, i.e., 13417569 + 480249 = 3663^2 + 693^2 .

It is a super-3 number, since 3×13897818³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 19248 + ... + 19956.

Almost surely, 2^13897818 is an apocalyptic number.

13897818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13897818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17139045).

13897818 is an abundant number, since it is smaller than the sum of its proper divisors (20380272).

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

13897818 is a wasteful number, since it uses less digits than its factorization.

13897818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745 (or 725 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 13897818 is about 3727.9777359850. The cubic root of 13897818 is about 240.4264293762.

The spelling of 13897818 in words is "thirteen million, eight hundred ninety-seven thousand, eight hundred eighteen".