19181996 has 12 divisors (see below), whose sum is σ = 33627552. Its totient is φ = 9574128.

The previous prime is 19181971. The next prime is 19182011. The reversal of 19181996 is 69918191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (2802296).

Almost surely, 2^19181996 is an apocalyptic number.

It is an amenable number.

19181996 is a deficient number, since it is larger than the sum of its proper divisors (14445556).

19181996 is a wasteful number, since it uses less digits than its factorization.

19181996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8440 (or 8438 counting only the distinct ones).

The product of its digits is 34992, while the sum is 44.

The square root of 19181996 is about 4379.7255621785. The cubic root of 19181996 is about 267.6894561438.

The spelling of 19181996 in words is "nineteen million, one hundred eighty-one thousand, nine hundred ninety-six".