197255640 has 32 divisors (see below), whose sum is σ = 591767280. Its totient is φ = 52601472.

The previous prime is 197255623. The next prime is 197255647. The reversal of 197255640 is 46552791.

197255640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197255647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821779 + ... + 822018.

Almost surely, 2^197255640 is an apocalyptic number.

197255640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197255640 is an abundant number, since it is smaller than the sum of its proper divisors (394511640).

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

197255640 is a wasteful number, since it uses less digits than its factorization.

197255640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643811 (or 1643807 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 197255640 is about 14044.7726930698. The cubic root of 197255640 is about 582.1163664769.

The spelling of 197255640 in words is "one hundred ninety-seven million, two hundred fifty-five thousand, six hundred forty".