18939442 has 8 divisors (see below), whose sum is σ = 29644416. Its totient is φ = 9057972.

The previous prime is 18939439. The next prime is 18939443. The reversal of 18939442 is 24493981.

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 = 18939395 and 18939404.

It is not an unprimeable number, because it can be changed into a prime (18939443) 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, 205818 + ... + 205909.

It is an arithmetic number, because the mean of its divisors is an integer number (3705552).

Almost surely, 2^18939442 is an apocalyptic number.

18939442 is a deficient number, since it is larger than the sum of its proper divisors (10704974).

18939442 is a wasteful number, since it uses less digits than its factorization.

18939442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411752.

The product of its digits is 62208, while the sum is 40.

The square root of 18939442 is about 4351.9469206322. The cubic root of 18939442 is about 266.5563665361.

The spelling of 18939442 in words is "eighteen million, nine hundred thirty-nine thousand, four hundred forty-two".