18719740 has 24 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 6911808.

The previous prime is 18719713. The next prime is 18719747. The reversal of 18719740 is 4791781.

It is a self number, because there is not a number n which added to its sum of digits gives 18719740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18719747) 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, 35740 + ... + 36259.

It is an arithmetic number, because the mean of its divisors is an integer number (1764000).

Almost surely, 2^18719740 is an apocalyptic number.

18719740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18719740 is an abundant number, since it is smaller than the sum of its proper divisors (23616260).

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

18719740 is a wasteful number, since it uses less digits than its factorization.

18719740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72021 (or 72019 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 18719740 is about 4326.6314841918. The cubic root of 18719740 is about 265.5216495741.

It can be divided in two parts, 1871 and 9740, that added together give a palindrome (11611).

The spelling of 18719740 in words is "eighteen million, seven hundred nineteen thousand, seven hundred forty".