197901900 has 288 divisors, whose sum is σ = 749396480. Its totient is φ = 43856640.

The previous prime is 197901883. The next prime is 197901931. The reversal of 197901900 is 9109791.

It is a super-2 number, since 2×197901900² = 78330324047220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 699159 + ... + 699441.

Almost surely, 2^197901900 is an apocalyptic number.

197901900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197901900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374698240).

197901900 is an abundant number, since it is smaller than the sum of its proper divisors (551494580).

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

197901900 is a wasteful number, since it uses less digits than its factorization.

197901900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 197901900 is about 14067.7610158831. The cubic root of 197901900 is about 582.7513942481.

The spelling of 197901900 in words is "one hundred ninety-seven million, nine hundred one thousand, nine hundred".