19798918 has 8 divisors (see below), whose sum is σ = 30116880. Its totient is φ = 9759960.

The previous prime is 19798907. The next prime is 19798921. The reversal of 19798918 is 81989791.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69573 + ... + 69856.

It is an arithmetic number, because the mean of its divisors is an integer number (3764610).

Almost surely, 2^19798918 is an apocalyptic number.

19798918 is a deficient number, since it is larger than the sum of its proper divisors (10317962).

19798918 is a wasteful number, since it uses less digits than its factorization.

19798918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139502.

The product of its digits is 326592, while the sum is 52.

The square root of 19798918 is about 4449.5975098878. The cubic root of 19798918 is about 270.5289949023.

The spelling of 19798918 in words is "nineteen million, seven hundred ninety-eight thousand, nine hundred eighteen".