18686061 has 6 divisors (see below), whose sum is σ = 26990990. Its totient is φ = 12457368.

The previous prime is 18686047. The next prime is 18686089. The reversal of 18686061 is 16068681.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 281961 = 4290^2 + 531^2 .

It is not a de Polignac number, because 18686061 - 2⁹ = 18685549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1038106 + ... + 1038123.

Almost surely, 2^18686061 is an apocalyptic number.

It is an amenable number.

18686061 is a deficient number, since it is larger than the sum of its proper divisors (8304929).

18686061 is a wasteful number, since it uses less digits than its factorization.

18686061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076235 (or 2076232 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18686061 is about 4322.7376742060. The cubic root of 18686061 is about 265.3623191583.

The spelling of 18686061 in words is "eighteen million, six hundred eighty-six thousand, sixty-one".