19397018 has 8 divisors (see below), whose sum is σ = 29805300. Its totient is φ = 9461920.

The previous prime is 19397011. The next prime is 19397047. The reversal of 19397018 is 81079391.

It can be written as a sum of positive squares in 2 ways, for example, as 19386409 + 10609 = 4403^2 + 103^2 .

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

It is not an unprimeable number, because it can be changed into a prime (19397011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118193 + ... + 118356.

Almost surely, 2^19397018 is an apocalyptic number.

19397018 is a deficient number, since it is larger than the sum of its proper divisors (10408282).

19397018 is a wasteful number, since it uses less digits than its factorization.

19397018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236592.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 19397018 is about 4404.2045819875. The cubic root of 19397018 is about 268.6859701075.

The spelling of 19397018 in words is "nineteen million, three hundred ninety-seven thousand, eighteen".