19930918 has 8 divisors (see below), whose sum is σ = 34167312. Its totient is φ = 8541816.

The previous prime is 19930891. The next prime is 19930921. The reversal of 19930918 is 81903991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 711805 + ... + 711832.

It is an arithmetic number, because the mean of its divisors is an integer number (4270914).

Almost surely, 2^19930918 is an apocalyptic number.

19930918 is a deficient number, since it is larger than the sum of its proper divisors (14236394).

19930918 is a wasteful number, since it uses less digits than its factorization.

19930918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423646.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 19930918 is about 4464.4056715312. The cubic root of 19930918 is about 271.1288721356.

The spelling of 19930918 in words is "nineteen million, nine hundred thirty thousand, nine hundred eighteen".