13665398 has 8 divisors (see below), whose sum is σ = 20689992. Its totient is φ = 6768736.

The previous prime is 13665383. The next prime is 13665413. The reversal of 13665398 is 89356631.

It is an interprime number because it is at equal distance from previous prime (13665383) and next prime (13665413).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31715 + ... + 32142.

It is an arithmetic number, because the mean of its divisors is an integer number (2586249).

Almost surely, 2^13665398 is an apocalyptic number.

13665398 is a deficient number, since it is larger than the sum of its proper divisors (7024594).

13665398 is a wasteful number, since it uses less digits than its factorization.

13665398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63966.

The product of its digits is 116640, while the sum is 41.

The square root of 13665398 is about 3696.6739104227. The cubic root of 13665398 is about 239.0786317136.

The spelling of 13665398 in words is "thirteen million, six hundred sixty-five thousand, three hundred ninety-eight".