18938934 has 96 divisors (see below), whose sum is σ = 51367680. Its totient is φ = 5108832.

The previous prime is 18938921. The next prime is 18938947. The reversal of 18938934 is 43983981.

It is an interprime number because it is at equal distance from previous prime (18938921) and next prime (18938947).

Its product of digits (186624) is a multiple of the sum of its prime divisors (324).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18938934.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64492 + ... + 64784.

It is an arithmetic number, because the mean of its divisors is an integer number (535080).

Almost surely, 2^18938934 is an apocalyptic number.

18938934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18938934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25683840).

18938934 is an abundant number, since it is smaller than the sum of its proper divisors (32428746).

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

18938934 is a wasteful number, since it uses less digits than its factorization.

18938934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 324 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18938934 is about 4351.8885555584. Note that the first 3 decimals coincide. The cubic root of 18938934 is about 266.5539832937.

The spelling of 18938934 in words is "eighteen million, nine hundred thirty-eight thousand, nine hundred thirty-four".