18453557 has 2 divisors, whose sum is σ = 18453558. Its totient is φ = 18453556.

The previous prime is 18453509. The next prime is 18453629. The reversal of 18453557 is 75535481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 3352561 = 3886^2 + 1831^2 .

It is a cyclic number.

It is not a de Polignac number, because 18453557 - 2⁸ = 18453301 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18453557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18423557) 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 as a sum of consecutive naturals, namely, 9226778 + 9226779.

It is an arithmetic number, because the mean of its divisors is an integer number (9226779).

Almost surely, 2^18453557 is an apocalyptic number.

It is an amenable number.

18453557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18453557 is an equidigital number, since it uses as much as digits as its factorization.

18453557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84000, while the sum is 38.

The square root of 18453557 is about 4295.7603517887. The cubic root of 18453557 is about 264.2571196027.

The spelling of 18453557 in words is "eighteen million, four hundred fifty-three thousand, five hundred fifty-seven".