13408681 has 16 divisors (see below), whose sum is σ = 16144128. Its totient is φ = 10972800.

The previous prime is 13408679. The next prime is 13408687. The reversal of 13408681 is 18680431.

13408681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13408681 - 2¹ = 13408679 is a prime.

It is a super-2 number, since 2×13408681² = 359585452319522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13408687) 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, 4720 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (1009008).

Almost surely, 2^13408681 is an apocalyptic number.

13408681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13408681 is a deficient number, since it is larger than the sum of its proper divisors (2735447).

13408681 is a wasteful number, since it uses less digits than its factorization.

13408681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 13408681 is about 3661.7865858075. The cubic root of 13408681 is about 237.5720542225.

The spelling of 13408681 in words is "thirteen million, four hundred eight thousand, six hundred eighty-one".