197531904 has 72 divisors (see below), whose sum is σ = 553433440. Its totient is φ = 62373888.

The previous prime is 197531903. The next prime is 197531921. The reversal of 197531904 is 409135791.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (197531903) 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, 7824 + ... + 21360.

Almost surely, 2^197531904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197531904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276716720).

197531904 is an abundant number, since it is smaller than the sum of its proper divisors (355901536).

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

197531904 is a wasteful number, since it uses less digits than its factorization.

197531904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13575 (or 13561 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 197531904 is about 14054.6043700988. The cubic root of 197531904 is about 582.3879983841.

The spelling of 197531904 in words is "one hundred ninety-seven million, five hundred thirty-one thousand, nine hundred four".