18860661 has 8 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 12573756.

The previous prime is 18860641. The next prime is 18860663. The reversal of 18860661 is 16606881.

It is not a de Polignac number, because 18860661 - 2⁵ = 18860629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18860663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349245 + ... + 349298.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^18860661 is an apocalyptic number.

It is an amenable number.

18860661 is a deficient number, since it is larger than the sum of its proper divisors (9081099).

18860661 is an equidigital number, since it uses as much as digits as its factorization.

18860661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698552 (or 698546 counting only the distinct ones).

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

The square root of 18860661 is about 4342.8862522521. The cubic root of 18860661 is about 266.1862612750.

The spelling of 18860661 in words is "eighteen million, eight hundred sixty thousand, six hundred sixty-one".