19872861 has 8 divisors (see below), whose sum is σ = 26759904. Its totient is φ = 13117200.

The previous prime is 19872857. The next prime is 19872871. The reversal of 19872861 is 16827891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19872861 - 2² = 19872857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19872821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32491 + ... + 33096.

It is an arithmetic number, because the mean of its divisors is an integer number (3344988).

Almost surely, 2^19872861 is an apocalyptic number.

It is an amenable number.

19872861 is a deficient number, since it is larger than the sum of its proper divisors (6887043).

19872861 is a wasteful number, since it uses less digits than its factorization.

19872861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65691.

The product of its digits is 48384, while the sum is 42.

The square root of 19872861 is about 4457.8987202493. The cubic root of 19872861 is about 270.8653579698.

The spelling of 19872861 in words is "nineteen million, eight hundred seventy-two thousand, eight hundred sixty-one".