13859681 has 16 divisors (see below), whose sum is σ = 15724800. Its totient is φ = 12105600.

The previous prime is 13859663. The next prime is 13859701. The reversal of 13859681 is 18695831.

It is a cyclic number.

It is not a de Polignac number, because 13859681 - 2²² = 9665377 is a prime.

It is a super-2 number, since 2×13859681² = 384181514843522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13859611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35435 + ... + 35823.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^13859681 is an apocalyptic number.

13859681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13859681 is a deficient number, since it is larger than the sum of its proper divisors (1865119).

13859681 is a wasteful number, since it uses less digits than its factorization.

13859681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its digits is 51840, while the sum is 41.

The square root of 13859681 is about 3722.8592506298. The cubic root of 13859681 is about 240.2063098687.

The spelling of 13859681 in words is "thirteen million, eight hundred fifty-nine thousand, six hundred eighty-one".