1981860196 has 24 divisors (see below), whose sum is σ = 3551929920. Its totient is φ = 967062432.

The previous prime is 1981860161. The next prime is 1981860229. The reversal of 1981860196 is 6910681891.

It is a happy number.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 230910 + ... + 239338.

It is an arithmetic number, because the mean of its divisors is an integer number (147997080).

Almost surely, 2^1981860196 is an apocalyptic number.

It is an amenable number.

1981860196 is a deficient number, since it is larger than the sum of its proper divisors (1570069724).

1981860196 is a wasteful number, since it uses less digits than its factorization.

1981860196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9843 (or 9841 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 1981860196 is about 44518.0884135876. The cubic root of 1981860196 is about 1256.1003552483.

The spelling of 1981860196 in words is "one billion, nine hundred eighty-one million, eight hundred sixty thousand, one hundred ninety-six".