18745477 has 2 divisors, whose sum is σ = 18745478. Its totient is φ = 18745476.

The previous prime is 18745439. The next prime is 18745537. The reversal of 18745477 is 77454781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16654561 + 2090916 = 4081^2 + 1446^2 .

It is a cyclic number.

It is not a de Polignac number, because 18745477 - 2¹⁵ = 18712709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18745277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372738 + 9372739.

It is an arithmetic number, because the mean of its divisors is an integer number (9372739).

Almost surely, 2^18745477 is an apocalyptic number.

It is an amenable number.

18745477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18745477 is an equidigital number, since it uses as much as digits as its factorization.

18745477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219520, while the sum is 43.

The square root of 18745477 is about 4329.6047163685. The cubic root of 18745477 is about 265.6432787790.

It can be divided in two parts, 1 and 8745477, that added together give a palindrome (8745478).

The spelling of 18745477 in words is "eighteen million, seven hundred forty-five thousand, four hundred seventy-seven".