19872117 has 24 divisors (see below), whose sum is σ = 29652480. Its totient is φ = 12817440.

The previous prime is 19872113. The next prime is 19872131. The reversal of 19872117 is 71127891.

It is not a de Polignac number, because 19872117 - 2² = 19872113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19872113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45892 + ... + 46322.

It is an arithmetic number, because the mean of its divisors is an integer number (1235520).

Almost surely, 2^19872117 is an apocalyptic number.

It is an amenable number.

19872117 is a deficient number, since it is larger than the sum of its proper divisors (9780363).

19872117 is a wasteful number, since it uses less digits than its factorization.

19872117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 590 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 19872117 is about 4457.8152720812. The cubic root of 19872117 is about 270.8619777093.

The spelling of 19872117 in words is "nineteen million, eight hundred seventy-two thousand, one hundred seventeen".