18939206 has 16 divisors (see below), whose sum is σ = 33375888. Its totient is φ = 7946400.

The previous prime is 18939203. The next prime is 18939211. The reversal of 18939206 is 60293981.

It is a self number, because there is not a number n which added to its sum of digits gives 18939206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939203) 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, 32825 + ... + 33396.

It is an arithmetic number, because the mean of its divisors is an integer number (2085993).

Almost surely, 2^18939206 is an apocalyptic number.

18939206 is a deficient number, since it is larger than the sum of its proper divisors (14436682).

18939206 is a wasteful number, since it uses less digits than its factorization.

18939206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66247.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 18939206 is about 4351.9198062464. The cubic root of 18939206 is about 266.5552593658. Note that the first 3 decimals are identical.

The spelling of 18939206 in words is "eighteen million, nine hundred thirty-nine thousand, two hundred six".