196661388 has 48 divisors (see below), whose sum is σ = 572108544. Its totient is φ = 51080640.

The previous prime is 196661363. The next prime is 196661407. The reversal of 196661388 is 883166691.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105495 + ... + 107342.

It is an arithmetic number, because the mean of its divisors is an integer number (11918928).

Almost surely, 2^196661388 is an apocalyptic number.

It is an amenable number.

196661388 is an abundant number, since it is smaller than the sum of its proper divisors (375447156).

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

196661388 is a wasteful number, since it uses less digits than its factorization.

196661388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212862 (or 212860 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 196661388 is about 14023.6011067058. The cubic root of 196661388 is about 581.5312175570.

The spelling of 196661388 in words is "one hundred ninety-six million, six hundred sixty-one thousand, three hundred eighty-eight".