13897729 has 8 divisors (see below), whose sum is σ = 14569632. Its totient is φ = 13241760.

The previous prime is 13897717. The next prime is 13897777. The reversal of 13897729 is 92779831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13897729 - 2¹⁷ = 13766657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13891729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2179 + ... + 5704.

It is an arithmetic number, because the mean of its divisors is an integer number (1821204).

It is a Proth number, since it is equal to 3393 ⋅ 2¹² + 1 and 3393 < 2¹².

Almost surely, 2^13897729 is an apocalyptic number.

It is an amenable number.

13897729 is a deficient number, since it is larger than the sum of its proper divisors (671903).

13897729 is an equidigital number, since it uses as much as digits as its factorization.

13897729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967.

The product of its digits is 190512, while the sum is 46.

The square root of 13897729 is about 3727.9657991993. The cubic root of 13897729 is about 240.4259161542.

The spelling of 13897729 in words is "thirteen million, eight hundred ninety-seven thousand, seven hundred twenty-nine".