197891320 has 128 divisors (see below), whose sum is σ = 505414080. Its totient is φ = 69120000.

The previous prime is 197891303. The next prime is 197891417. The reversal of 197891320 is 23198791.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1959270 + ... + 1959370.

Almost surely, 2^197891320 is an apocalyptic number.

197891320 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 197891320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252707040).

197891320 is an abundant number, since it is smaller than the sum of its proper divisors (307522760).

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

197891320 is a wasteful number, since it uses less digits than its factorization.

197891320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 197891320 is about 14067.3849737611. The cubic root of 197891320 is about 582.7410092718.

The spelling of 197891320 in words is "one hundred ninety-seven million, eight hundred ninety-one thousand, three hundred twenty".