13998657 has 4 divisors (see below), whose sum is σ = 18664880. Its totient is φ = 9332436.

The previous prime is 13998653. The next prime is 13998659. The reversal of 13998657 is 75689931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13998657 - 2² = 13998653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13998653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2333107 + ... + 2333112.

It is an arithmetic number, because the mean of its divisors is an integer number (4666220).

Almost surely, 2^13998657 is an apocalyptic number.

It is an amenable number.

13998657 is a deficient number, since it is larger than the sum of its proper divisors (4666223).

13998657 is an equidigital number, since it uses as much as digits as its factorization.

13998657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666222.

The product of its digits is 408240, while the sum is 48.

The square root of 13998657 is about 3741.4779165458. The cubic root of 13998657 is about 241.0065194543.

The spelling of 13998657 in words is "thirteen million, nine hundred ninety-eight thousand, six hundred fifty-seven".