19797898 has 8 divisors (see below), whose sum is σ = 29748708. Its totient is φ = 9881664.

The previous prime is 19797893. The next prime is 19797901. The reversal of 19797898 is 89879791.

It can be written as a sum of positive squares in 2 ways, for example, as 19035769 + 762129 = 4363^2 + 873^2 .

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 (19797893) 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, 7161 + ... + 9532.

Almost surely, 2^19797898 is an apocalyptic number.

19797898 is a deficient number, since it is larger than the sum of its proper divisors (9950810).

19797898 is a wasteful number, since it uses less digits than its factorization.

19797898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17288.

The product of its digits is 2286144, while the sum is 58.

The square root of 19797898 is about 4449.4828913032. The cubic root of 19797898 is about 270.5243491212.

The spelling of 19797898 in words is "nineteen million, seven hundred ninety-seven thousand, eight hundred ninety-eight".