18879136 has 48 divisors (see below), whose sum is σ = 39299904. Its totient is φ = 8909824.

The previous prime is 18879131. The next prime is 18879143. The reversal of 18879136 is 63197881.

It is a super-2 number, since 2×18879136² = 712843552212992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18879092 and 18879101.

It is not an unprimeable number, because it can be changed into a prime (18879131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83055 + ... + 83281.

It is an arithmetic number, because the mean of its divisors is an integer number (818748).

Almost surely, 2^18879136 is an apocalyptic number.

18879136 is a gapful number since it is divisible by the number (16) 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 18879136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19649952).

18879136 is an abundant number, since it is smaller than the sum of its proper divisors (20420768).

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

18879136 is a wasteful number, since it uses less digits than its factorization.

18879136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 365 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 18879136 is about 4345.0127732839. The cubic root of 18879136 is about 266.2731473480.

The spelling of 18879136 in words is "eighteen million, eight hundred seventy-nine thousand, one hundred thirty-six".