18809057 has 2 divisors, whose sum is σ = 18809058. Its totient is φ = 18809056.

The previous prime is 18809053. The next prime is 18809083. The reversal of 18809057 is 75090881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12737761 + 6071296 = 3569^2 + 2464^2 .

It is an emirp because it is prime and its reverse (75090881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18809057 - 2² = 18809053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18809057.

It is not a weakly prime, because it can be changed into another prime (18809051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9404528 + 9404529.

It is an arithmetic number, because the mean of its divisors is an integer number (9404529).

Almost surely, 2^18809057 is an apocalyptic number.

It is an amenable number.

18809057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18809057 is an equidigital number, since it uses as much as digits as its factorization.

18809057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 18809057 is about 4336.9409726211. The cubic root of 18809057 is about 265.9432718646.

The spelling of 18809057 in words is "eighteen million, eight hundred nine thousand, fifty-seven".