13400681 has 12 divisors (see below), whose sum is σ = 16166592. Its totient is φ = 10879704.

The previous prime is 13400657. The next prime is 13400689. The reversal of 13400681 is 18600431.

It is a de Polignac number, because none of the positive numbers 2^k-13400681 is a prime.

It is a super-2 number, since 2×13400681² = 359156502527522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13400689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125 + ... + 5178.

It is an arithmetic number, because the mean of its divisors is an integer number (1347216).

Almost surely, 2^13400681 is an apocalyptic number.

It is an amenable number.

13400681 is a deficient number, since it is larger than the sum of its proper divisors (2765911).

13400681 is an equidigital number, since it uses as much as digits as its factorization.

13400681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5348 (or 5329 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 13400681 is about 3660.6940598744. The cubic root of 13400681 is about 237.5247974108.

The spelling of 13400681 in words is "thirteen million, four hundred thousand, six hundred eighty-one".