13643975 has 6 divisors (see below), whose sum is σ = 16918560. Its totient is φ = 10915160.

The previous prime is 13643963. The next prime is 13643977. The reversal of 13643975 is 57934631.

It is a happy number.

It is not a de Polignac number, because 13643975 - 2⁸ = 13643719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13643977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 272855 + ... + 272904.

It is an arithmetic number, because the mean of its divisors is an integer number (2819760).

Almost surely, 2^13643975 is an apocalyptic number.

13643975 is a deficient number, since it is larger than the sum of its proper divisors (3274585).

13643975 is an equidigital number, since it uses as much as digits as its factorization.

13643975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545769 (or 545764 counting only the distinct ones).

The product of its digits is 68040, while the sum is 38.

The square root of 13643975 is about 3693.7751691190. The cubic root of 13643975 is about 238.9536332735.

The spelling of 13643975 in words is "thirteen million, six hundred forty-three thousand, nine hundred seventy-five".