19797618 has 16 divisors (see below), whose sum is σ = 41317056. Its totient is φ = 6312240.

The previous prime is 19797581. The next prime is 19797619. The reversal of 19797618 is 81679791.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19797619) 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, 71593 + ... + 71868.

It is an arithmetic number, because the mean of its divisors is an integer number (2582316).

Almost surely, 2^19797618 is an apocalyptic number.

19797618 is an abundant number, since it is smaller than the sum of its proper divisors (21519438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19797618 is a wasteful number, since it uses less digits than its factorization.

19797618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143489.

The product of its digits is 190512, while the sum is 48.

The square root of 19797618 is about 4449.4514268615. The cubic root of 19797618 is about 270.5230737809.

The spelling of 19797618 in words is "nineteen million, seven hundred ninety-seven thousand, six hundred eighteen".