197523820 has 36 divisors (see below), whose sum is σ = 449169840. Its totient is φ = 72930624.

The previous prime is 197523769. The next prime is 197523827. The reversal of 197523820 is 28325791.

It is a self number, because there is not a number n which added to its sum of digits gives 197523820.

It is not an unprimeable number, because it can be changed into a prime (197523827) 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 11 ways as a sum of consecutive naturals, for example, 25840 + ... + 32599.

It is an arithmetic number, because the mean of its divisors is an integer number (12476940).

Almost surely, 2^197523820 is an apocalyptic number.

197523820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197523820 is an abundant number, since it is smaller than the sum of its proper divisors (251646020).

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

197523820 is a wasteful number, since it uses less digits than its factorization.

197523820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58474 (or 58459 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 197523820 is about 14054.3167745714. The cubic root of 197523820 is about 582.3800535260.

The spelling of 197523820 in words is "one hundred ninety-seven million, five hundred twenty-three thousand, eight hundred twenty".