19009868 has 24 divisors (see below), whose sum is σ = 35008512. Its totient is φ = 9014544.

The previous prime is 19009847. The next prime is 19009871. The reversal of 19009868 is 86890091.

It is a super-2 number, since 2×19009868² = 722750162754848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10871 + ... + 12497.

It is an arithmetic number, because the mean of its divisors is an integer number (1458688).

Almost surely, 2^19009868 is an apocalyptic number.

It is an amenable number.

19009868 is a deficient number, since it is larger than the sum of its proper divisors (15998644).

19009868 is a wasteful number, since it uses less digits than its factorization.

19009868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 19009868 is about 4360.0307338366. The cubic root of 19009868 is about 266.8863529953.

The spelling of 19009868 in words is "nineteen million, nine thousand, eight hundred sixty-eight".