13406557 has 4 divisors (see below), whose sum is σ = 14195196. Its totient is φ = 12617920.

The previous prime is 13406531. The next prime is 13406579. The reversal of 13406557 is 75560431.

13406557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8415801 + 4990756 = 2901^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 13406557 - 2⁷ = 13406429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13406527) 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, 394294 + ... + 394327.

It is an arithmetic number, because the mean of its divisors is an integer number (3548799).

Almost surely, 2^13406557 is an apocalyptic number.

13406557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13406557 is a deficient number, since it is larger than the sum of its proper divisors (788639).

13406557 is an equidigital number, since it uses as much as digits as its factorization.

13406557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788638.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 13406557 is about 3661.4965519580. The cubic root of 13406557 is about 237.5595093721.

Adding to 13406557 its reverse (75560431), we get a palindrome (88966988).

The spelling of 13406557 in words is "thirteen million, four hundred six thousand, five hundred fifty-seven".