13665940 has 24 divisors (see below), whose sum is σ = 30209760. Its totient is φ = 5178528.

The previous prime is 13665929. The next prime is 13665961. The reversal of 13665940 is 4956631.

It is a junction number, because it is equal to n+sod(n) for n = 13665896 and 13665905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17602 + ... + 18361.

It is an arithmetic number, because the mean of its divisors is an integer number (1258740).

Almost surely, 2^13665940 is an apocalyptic number.

13665940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13665940 is an abundant number, since it is smaller than the sum of its proper divisors (16543820).

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

13665940 is a wasteful number, since it uses less digits than its factorization.

13665940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35991 (or 35989 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 13665940 is about 3696.7472188398. The cubic root of 13665940 is about 239.0817924681.

The spelling of 13665940 in words is "thirteen million, six hundred sixty-five thousand, nine hundred forty".