18479838 has 32 divisors (see below), whose sum is σ = 40320000. Its totient is φ = 5612256.

The previous prime is 18479831. The next prime is 18479849. The reversal of 18479838 is 83897481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18479831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4663 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (1260000).

Almost surely, 2^18479838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18479838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20160000).

18479838 is an abundant number, since it is smaller than the sum of its proper divisors (21840162).

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

18479838 is a wasteful number, since it uses less digits than its factorization.

18479838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096.

The product of its digits is 387072, while the sum is 48.

The square root of 18479838 is about 4298.8182096944. The cubic root of 18479838 is about 264.3825091061.

The spelling of 18479838 in words is "eighteen million, four hundred seventy-nine thousand, eight hundred thirty-eight".