18689357 has 2 divisors, whose sum is σ = 18689358. Its totient is φ = 18689356.

The previous prime is 18689351. The next prime is 18689383. The reversal of 18689357 is 75398681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 276676 = 4291^2 + 526^2 .

It is a cyclic number.

It is not a de Polignac number, because 18689357 - 2¹⁶ = 18623821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18689351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9344678 + 9344679.

It is an arithmetic number, because the mean of its divisors is an integer number (9344679).

Almost surely, 2^18689357 is an apocalyptic number.

It is an amenable number.

18689357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18689357 is an equidigital number, since it uses as much as digits as its factorization.

18689357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 18689357 is about 4323.1188972778. The cubic root of 18689357 is about 265.3779204985.

The spelling of 18689357 in words is "eighteen million, six hundred eighty-nine thousand, three hundred fifty-seven".