197715920 has 20 divisors (see below), whose sum is σ = 459689700. Its totient is φ = 79086336.

The previous prime is 197715913. The next prime is 197715929. The reversal of 197715920 is 29517791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53523856 + 144192064 = 7316^2 + 12008^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197715929) 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, 1235645 + ... + 1235804.

It is an arithmetic number, because the mean of its divisors is an integer number (22984485).

Almost surely, 2^197715920 is an apocalyptic number.

197715920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197715920 is an abundant number, since it is smaller than the sum of its proper divisors (261973780).

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

197715920 is a wasteful number, since it uses less digits than its factorization.

197715920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471462 (or 2471456 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 197715920 is about 14061.1493129118. The cubic root of 197715920 is about 582.5687885018.

The spelling of 197715920 in words is "one hundred ninety-seven million, seven hundred fifteen thousand, nine hundred twenty".