13686975 has 42 divisors (see below), whose sum is σ = 25480016. Its totient is φ = 7290000.

The previous prime is 13686971. The next prime is 13686979. The reversal of 13686975 is 57968631.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13686971) and next prime (13686979).

It is not a de Polignac number, because 13686975 - 2² = 13686971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13686975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13686971) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 17850 + ... + 18600.

Almost surely, 2^13686975 is an apocalyptic number.

13686975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13686975 is a deficient number, since it is larger than the sum of its proper divisors (11793041).

13686975 is an frugal number, since it uses more digits than its factorization.

13686975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 759 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 13686975 is about 3699.5911936321. The cubic root of 13686975 is about 239.2043967287.

The spelling of 13686975 in words is "thirteen million, six hundred eighty-six thousand, nine hundred seventy-five".