18861306 has 8 divisors (see below), whose sum is σ = 37722624. Its totient is φ = 6287100.

The previous prime is 18861301. The next prime is 18861307. The reversal of 18861306 is 60316881.

It is a sphenic number, since it is the product of 3 distinct primes.

18861306 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18861301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1571770 + ... + 1571781.

It is an arithmetic number, because the mean of its divisors is an integer number (4715328).

Almost surely, 2^18861306 is an apocalyptic number.

18861306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18861306 is a wasteful number, since it uses less digits than its factorization.

18861306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3143556.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18861306 is about 4342.9605109879. The cubic root of 18861306 is about 266.1892956010.

The spelling of 18861306 in words is "eighteen million, eight hundred sixty-one thousand, three hundred six".