197979790 has 16 divisors (see below), whose sum is σ = 377326512. Its totient is φ = 74533504.

The previous prime is 197979787. The next prime is 197979797. The reversal of 197979790 is 97979791.

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 7 ways as a sum of consecutive naturals, for example, 582124 + ... + 582463.

It is an arithmetic number, because the mean of its divisors is an integer number (23582907).

Almost surely, 2^197979790 is an apocalyptic number.

197979790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197979790 is a deficient number, since it is larger than the sum of its proper divisors (179346722).

197979790 is a wasteful number, since it uses less digits than its factorization.

197979790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164611.

The product of its (nonzero) digits is 2250423, while the sum is 58.

The square root of 197979790 is about 14070.5291300647. The cubic root of 197979790 is about 582.8278370925.

Subtracting from 197979790 its reverse (97979791), we obtain a palindrome (99999999).

The spelling of 197979790 in words is "one hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred ninety".