18139248 has 80 divisors (see below), whose sum is σ = 52576000. Its totient is φ = 5987520.

The previous prime is 18139237. The next prime is 18139267. The reversal of 18139248 is 84293181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85863 + ... + 86073.

It is an arithmetic number, because the mean of its divisors is an integer number (657200).

Almost surely, 2^18139248 is an apocalyptic number.

18139248 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18139248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26288000).

18139248 is an abundant number, since it is smaller than the sum of its proper divisors (34436752).

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

18139248 is a wasteful number, since it uses less digits than its factorization.

18139248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 415 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18139248 is about 4259.0196054961. The cubic root of 18139248 is about 262.7482060519.

The spelling of 18139248 in words is "eighteen million, one hundred thirty-nine thousand, two hundred forty-eight".