197221540 has 48 divisors (see below), whose sum is σ = 424347840. Its totient is φ = 76970880.

The previous prime is 197221517. The next prime is 197221559. The reversal of 197221540 is 45122791.

197221540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 168999 + ... + 170161.

It is an arithmetic number, because the mean of its divisors is an integer number (8840580).

Almost surely, 2^197221540 is an apocalyptic number.

197221540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197221540 is an abundant number, since it is smaller than the sum of its proper divisors (227126300).

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

197221540 is a wasteful number, since it uses less digits than its factorization.

With its successor (197221541) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1372).

197221540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372 (or 1370 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 197221540 is about 14043.5586658083. The cubic root of 197221540 is about 582.0828206477.

The spelling of 197221540 in words is "one hundred ninety-seven million, two hundred twenty-one thousand, five hundred forty".