19481918 has 16 divisors (see below), whose sum is σ = 30015360. Its totient is φ = 9480216.

The previous prime is 19481911. The next prime is 19481933. The reversal of 19481918 is 81918491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19481911) 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, 11855 + ... + 13397.

It is an arithmetic number, because the mean of its divisors is an integer number (1875960).

Almost surely, 2^19481918 is an apocalyptic number.

19481918 is a deficient number, since it is larger than the sum of its proper divisors (10533442).

19481918 is a wasteful number, since it uses less digits than its factorization.

19481918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711.

The product of its digits is 20736, while the sum is 41.

The square root of 19481918 is about 4413.8325749851. The cubic root of 19481918 is about 269.0774089352.

The spelling of 19481918 in words is "nineteen million, four hundred eighty-one thousand, nine hundred eighteen".