18696487 has 2 divisors, whose sum is σ = 18696488. Its totient is φ = 18696486.

The previous prime is 18696479. The next prime is 18696521. The reversal of 18696487 is 78469681.

It is a weak prime.

It is an emirp because it is prime and its reverse (78469681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18696487 - 2³ = 18696479 is a prime.

It is a super-2 number, since 2×18696487² = 699117252282338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18696487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18696427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9348243 + 9348244.

It is an arithmetic number, because the mean of its divisors is an integer number (9348244).

Almost surely, 2^18696487 is an apocalyptic number.

18696487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18696487 is an equidigital number, since it uses as much as digits as its factorization.

18696487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 18696487 is about 4323.9434547644. The cubic root of 18696487 is about 265.4116634822.

The spelling of 18696487 in words is "eighteen million, six hundred ninety-six thousand, four hundred eighty-seven".