19659144 has 16 divisors (see below), whose sum is σ = 49147920. Its totient is φ = 6553040.

The previous prime is 19659139. The next prime is 19659163. The reversal of 19659144 is 44195691.

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 3 ways as a sum of consecutive naturals, for example, 409542 + ... + 409589.

It is an arithmetic number, because the mean of its divisors is an integer number (3071745).

Almost surely, 2^19659144 is an apocalyptic number.

It is an amenable number.

19659144 is an abundant number, since it is smaller than the sum of its proper divisors (29488776).

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

19659144 is a wasteful number, since it uses less digits than its factorization.

19659144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819140 (or 819136 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 19659144 is about 4433.8633267163. The cubic root of 19659144 is about 269.8908749684.

It can be divided in two parts, 196 and 59144, that added together give a triangular number (59340 = T₃₄₄).

The spelling of 19659144 in words is "nineteen million, six hundred fifty-nine thousand, one hundred forty-four".