18939294 has 48 divisors (see below), whose sum is σ = 45877104. Its totient is φ = 5596800.

The previous prime is 18939293. The next prime is 18939299. The reversal of 18939294 is 49293981.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939293) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6952 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (955773).

Almost surely, 2^18939294 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18939294, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22938552).

18939294 is an abundant number, since it is smaller than the sum of its proper divisors (26937810).

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

18939294 is a wasteful number, since it uses less digits than its factorization.

18939294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393 (or 2390 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 18939294 is about 4351.9299167151. The cubic root of 18939294 is about 266.5556722101. Note that the first 3 decimals are identical.

The spelling of 18939294 in words is "eighteen million, nine hundred thirty-nine thousand, two hundred ninety-four".