197257540 has 12 divisors (see below), whose sum is σ = 414240876. Its totient is φ = 78903008.

The previous prime is 197257513. The next prime is 197257589. The reversal of 197257540 is 45752791.

It can be written as a sum of positive squares in 2 ways, for example, as 110544196 + 86713344 = 10514^2 + 9312^2 .

It is a super-3 number, since 3×197257540³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 197257493 and 197257502.

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 3 ways as a sum of consecutive naturals, for example, 4931419 + ... + 4931458.

It is an arithmetic number, because the mean of its divisors is an integer number (34520073).

Almost surely, 2^197257540 is an apocalyptic number.

197257540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197257540 is an abundant number, since it is smaller than the sum of its proper divisors (216983336).

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

197257540 is a wasteful number, since it uses less digits than its factorization.

197257540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9862886 (or 9862884 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 197257540 is about 14044.8403337311. The cubic root of 197257540 is about 582.1182354856.

The spelling of 197257540 in words is "one hundred ninety-seven million, two hundred fifty-seven thousand, five hundred forty".