18819340 has 24 divisors (see below), whose sum is σ = 41846112. Its totient is φ = 7084800.

The previous prime is 18819319. The next prime is 18819341. The reversal of 18819340 is 4391881.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 18819296 and 18819305.

It is not an unprimeable number, because it can be changed into a prime (18819341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27336 + ... + 28015.

It is an arithmetic number, because the mean of its divisors is an integer number (1743588).

Almost surely, 2^18819340 is an apocalyptic number.

18819340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18819340 is an abundant number, since it is smaller than the sum of its proper divisors (23026772).

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

18819340 is a wasteful number, since it uses less digits than its factorization.

18819340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55377 (or 55375 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18819340 is about 4338.1263236563. The cubic root of 18819340 is about 265.9917271816.

The spelling of 18819340 in words is "eighteen million, eight hundred nineteen thousand, three hundred forty".