18819138 has 16 divisors (see below), whose sum is σ = 40533696. Its totient is φ = 5790480.

The previous prime is 18819137. The next prime is 18819167. The reversal of 18819138 is 83191881.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18819096 and 18819105.

It is not an unprimeable number, because it can be changed into a prime (18819131) 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, 120558 + ... + 120713.

It is an arithmetic number, because the mean of its divisors is an integer number (2533356).

Almost surely, 2^18819138 is an apocalyptic number.

18819138 is an abundant number, since it is smaller than the sum of its proper divisors (21714558).

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

18819138 is a wasteful number, since it uses less digits than its factorization.

18819138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241289.

The product of its digits is 13824, while the sum is 39.

The square root of 18819138 is about 4338.1030416531. The cubic root of 18819138 is about 265.9907754918.

The spelling of 18819138 in words is "eighteen million, eight hundred nineteen thousand, one hundred thirty-eight".