19730818 has 16 divisors (see below), whose sum is σ = 30760704. Its totient is φ = 9481680.

The previous prime is 19730813. The next prime is 19730833. The reversal of 19730818 is 81803791.

It is not an unprimeable number, because it can be changed into a prime (19730813) 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, 8721 + ... + 10747.

It is an arithmetic number, because the mean of its divisors is an integer number (1922544).

Almost surely, 2^19730818 is an apocalyptic number.

19730818 is a deficient number, since it is larger than the sum of its proper divisors (11029886).

19730818 is a wasteful number, since it uses less digits than its factorization.

19730818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 19730818 is about 4441.9385407725. The cubic root of 19730818 is about 270.2184697260.

The spelling of 19730818 in words is "nineteen million, seven hundred thirty thousand, eight hundred eighteen".