13818557 has 4 divisors (see below), whose sum is σ = 13827936. Its totient is φ = 13809180.

The previous prime is 13818551. The next prime is 13818559. The reversal of 13818557 is 75581831.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13818557 - 2¹² = 13814461 is a prime.

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 13818557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13818551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943 + ... + 5604.

It is an arithmetic number, because the mean of its divisors is an integer number (3456984).

Almost surely, 2^13818557 is an apocalyptic number.

It is an amenable number.

13818557 is a deficient number, since it is larger than the sum of its proper divisors (9379).

13818557 is an equidigital number, since it uses as much as digits as its factorization.

13818557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9378.

The product of its digits is 33600, while the sum is 38.

The square root of 13818557 is about 3717.3319733379. The cubic root of 13818557 is about 239.9684970224.

The spelling of 13818557 in words is "thirteen million, eight hundred eighteen thousand, five hundred fifty-seven".