197931840 has 56 divisors (see below), whose sum is σ = 628436640. Its totient is φ = 52781568.

The previous prime is 197931827. The next prime is 197931841. The reversal of 197931840 is 48139791.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 197931792 and 197931801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197931841) 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, 102130 + ... + 104049.

Almost surely, 2^197931840 is an apocalyptic number.

197931840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197931840 is an abundant number, since it is smaller than the sum of its proper divisors (430504800).

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

197931840 is a wasteful number, since it uses less digits than its factorization.

197931840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206199 (or 206189 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 197931840 is about 14068.8251108612. The cubic root of 197931840 is about 582.7807803512.

The spelling of 197931840 in words is "one hundred ninety-seven million, nine hundred thirty-one thousand, eight hundred forty".