197979798 has 8 divisors (see below), whose sum is σ = 395959608. Its totient is φ = 65993264.

The previous prime is 197979797. The next prime is 197979827. The reversal of 197979798 is 897979791.

It is a happy number.

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

197979798 is an admirable number.

It is a super-2 number, since 2×197979798² = 78392000832241608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197979797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16498311 + ... + 16498322.

It is an arithmetic number, because the mean of its divisors is an integer number (49494951).

Almost surely, 2^197979798 is an apocalyptic number.

197979798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

197979798 is a wasteful number, since it uses less digits than its factorization.

197979798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32996638.

The product of its digits is 18003384, while the sum is 66.

The square root of 197979798 is about 14070.5294143469. The cubic root of 197979798 is about 582.8278449429.

The spelling of 197979798 in words is "one hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred ninety-eight".