197821242 has 48 divisors (see below), whose sum is σ = 440339328. Its totient is φ = 64149120.

The previous prime is 197821181. The next prime is 197821249. The reversal of 197821242 is 242128791.

197821242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 197821197 and 197821206.

It is not an unprimeable number, because it can be changed into a prime (197821249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333298 + ... + 333890.

It is an arithmetic number, because the mean of its divisors is an integer number (9173736).

Almost surely, 2^197821242 is an apocalyptic number.

197821242 is an abundant number, since it is smaller than the sum of its proper divisors (242518086).

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

197821242 is a wasteful number, since it uses less digits than its factorization.

197821242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075 (or 1072 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 197821242 is about 14064.8939562302. The cubic root of 197821242 is about 582.6722136893.

It can be divided in two parts, 1978 and 21242, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 197821242 in words is "one hundred ninety-seven million, eight hundred twenty-one thousand, two hundred forty-two".