197223840 has 144 divisors (see below), whose sum is σ = 734269536. Its totient is φ = 47808000.

The previous prime is 197223839. The next prime is 197223869. The reversal of 197223840 is 48322791.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 197223795 and 197223804.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9615 + ... + 22065.

It is an arithmetic number, because the mean of its divisors is an integer number (5099094).

Almost surely, 2^197223840 is an apocalyptic number.

197223840 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 197223840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367134768).

197223840 is an abundant number, since it is smaller than the sum of its proper divisors (537045696).

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

197223840 is a wasteful number, since it uses less digits than its factorization.

197223840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12483 (or 12472 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 197223840 is about 14043.6405536456. The cubic root of 197223840 is about 582.0850833912.

The spelling of 197223840 in words is "one hundred ninety-seven million, two hundred twenty-three thousand, eight hundred forty".