18861677 has 2 divisors, whose sum is σ = 18861678. Its totient is φ = 18861676.

The previous prime is 18861673. The next prime is 18861683. The reversal of 18861677 is 77616881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 2709316 = 4019^2 + 1646^2 .

It is a cyclic number.

It is not a de Polignac number, because 18861677 - 2² = 18861673 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 (18861673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430838 + 9430839.

It is an arithmetic number, because the mean of its divisors is an integer number (9430839).

Almost surely, 2^18861677 is an apocalyptic number.

It is an amenable number.

18861677 is a deficient number, since it is larger than the sum of its proper divisors (1).

18861677 is an equidigital number, since it uses as much as digits as its factorization.

18861677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 18861677 is about 4343.0032235770. The cubic root of 18861677 is about 266.1910408951.

The spelling of 18861677 in words is "eighteen million, eight hundred sixty-one thousand, six hundred seventy-seven".