18087977 has 2 divisors, whose sum is σ = 18087978. Its totient is φ = 18087976.

The previous prime is 18087899. The next prime is 18087991. The reversal of 18087977 is 77978081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 2374681 = 3964^2 + 1541^2 .

It is a cyclic number.

It is not a de Polignac number, because 18087977 - 2¹⁴ = 18071593 is a prime.

It is not a weakly prime, because it can be changed into another prime (18087577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9043988 + 9043989.

It is an arithmetic number, because the mean of its divisors is an integer number (9043989).

Almost surely, 2^18087977 is an apocalyptic number.

It is an amenable number.

18087977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18087977 is an equidigital number, since it uses as much as digits as its factorization.

18087977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 18087977 is about 4252.9962379480. The cubic root of 18087977 is about 262.5004178376.

The spelling of 18087977 in words is "eighteen million, eighty-seven thousand, nine hundred seventy-seven".