197797420 has 48 divisors (see below), whose sum is σ = 428617728. Its totient is φ = 76628160.

The previous prime is 197797393. The next prime is 197797421. The reversal of 197797420 is 24797791.

It is not an unprimeable number, because it can be changed into a prime (197797421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108315 + ... + 110125.

It is an arithmetic number, because the mean of its divisors is an integer number (8929536).

Almost surely, 2^197797420 is an apocalyptic number.

197797420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197797420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214308864).

197797420 is an abundant number, since it is smaller than the sum of its proper divisors (230820308).

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

197797420 is a wasteful number, since it uses less digits than its factorization.

197797420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 46.

The square root of 197797420 is about 14064.0470704559. The cubic root of 197797420 is about 582.6488239283.

The spelling of 197797420 in words is "one hundred ninety-seven million, seven hundred ninety-seven thousand, four hundred twenty".