19900018 has 8 divisors (see below), whose sum is σ = 30033648. Its totient is φ = 9888804.

The previous prime is 19900009. The next prime is 19900057. The reversal of 19900018 is 81000991.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30196 + ... + 30847.

It is an arithmetic number, because the mean of its divisors is an integer number (3754206).

Almost surely, 2^19900018 is an apocalyptic number.

19900018 is a deficient number, since it is larger than the sum of its proper divisors (10133630).

19900018 is a wasteful number, since it uses less digits than its factorization.

19900018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61208.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 19900018 is about 4460.9436221499. The cubic root of 19900018 is about 270.9886843221.

The spelling of 19900018 in words is "nineteen million, nine hundred thousand, eighteen".