197800155 has 96 divisors (see below), whose sum is σ = 413337600. Its totient is φ = 85591296.

The previous prime is 197800139. The next prime is 197800157. The reversal of 197800155 is 551008791.

It is not a de Polignac number, because 197800155 - 2⁴ = 197800139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197800157) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 538782 + ... + 539148.

It is an arithmetic number, because the mean of its divisors is an integer number (4305600).

Almost surely, 2^197800155 is an apocalyptic number.

197800155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

197800155 is an abundant number, since it is smaller than the sum of its proper divisors (215537445).

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

197800155 is a wasteful number, since it uses less digits than its factorization.

197800155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 197800155 is about 14064.1443038672. The cubic root of 197800155 is about 582.6515093985.

The spelling of 197800155 in words is "one hundred ninety-seven million, eight hundred thousand, one hundred fifty-five".