18939434 has 8 divisors (see below), whose sum is σ = 28685280. Its totient is φ = 9377676.

The previous prime is 18939421. The next prime is 18939439. The reversal of 18939434 is 43493981.

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

It is a junction number, because it is equal to n+sod(n) for n = 18939391 and 18939400.

It is not an unprimeable number, because it can be changed into a prime (18939439) 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, 45764 + ... + 46175.

It is an arithmetic number, because the mean of its divisors is an integer number (3585660).

Almost surely, 2^18939434 is an apocalyptic number.

18939434 is a deficient number, since it is larger than the sum of its proper divisors (9745846).

18939434 is a wasteful number, since it uses less digits than its factorization.

18939434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92044.

The product of its digits is 93312, while the sum is 41.

The square root of 18939434 is about 4351.9460015032. The cubic root of 18939434 is about 266.5563290051.

The spelling of 18939434 in words is "eighteen million, nine hundred thirty-nine thousand, four hundred thirty-four".