18705077 has 2 divisors, whose sum is σ = 18705078. Its totient is φ = 18705076.

The previous prime is 18705073. The next prime is 18705103. The reversal of 18705077 is 77050781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 8213956 = 3239^2 + 2866^2 .

It is an emirp because it is prime and its reverse (77050781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18705077 - 2² = 18705073 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18705073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9352538 + 9352539.

It is an arithmetic number, because the mean of its divisors is an integer number (9352539).

Almost surely, 2^18705077 is an apocalyptic number.

It is an amenable number.

18705077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18705077 is an equidigital number, since it uses as much as digits as its factorization.

18705077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13720, while the sum is 35.

The square root of 18705077 is about 4324.9366469348. The cubic root of 18705077 is about 265.4523045773.

It can be divided in two parts, 1 and 8705077, that added together give a palindrome (8705078).

The spelling of 18705077 in words is "eighteen million, seven hundred five thousand, seventy-seven".