18878838 has 16 divisors (see below), whose sum is σ = 41190336. Its totient is φ = 5720840.

The previous prime is 18878833. The next prime is 18878861. The reversal of 18878838 is 83887881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18878833) 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, 142956 + ... + 143087.

It is an arithmetic number, because the mean of its divisors is an integer number (2574396).

Almost surely, 2^18878838 is an apocalyptic number.

18878838 is an abundant number, since it is smaller than the sum of its proper divisors (22311498).

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

18878838 is a wasteful number, since it uses less digits than its factorization.

18878838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286059.

The product of its digits is 688128, while the sum is 51.

The square root of 18878838 is about 4344.9784809594. The cubic root of 18878838 is about 266.2717463337.

The spelling of 18878838 in words is "eighteen million, eight hundred seventy-eight thousand, eight hundred thirty-eight".