19768987 has 8 divisors (see below), whose sum is σ = 23782400. Its totient is φ = 16052904.

The previous prime is 19768967. The next prime is 19768993. The reversal of 19768987 is 78986791.

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

It is not a de Polignac number, because 19768987 - 2¹⁵ = 19736219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19768907) 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, 74187 + ... + 74452.

It is an arithmetic number, because the mean of its divisors is an integer number (2972800).

Almost surely, 2^19768987 is an apocalyptic number.

19768987 is a deficient number, since it is larger than the sum of its proper divisors (4013413).

19768987 is a wasteful number, since it uses less digits than its factorization.

19768987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148665.

The product of its digits is 1524096, while the sum is 55.

The square root of 19768987 is about 4446.2328998828. The cubic root of 19768987 is about 270.3926021443.

The spelling of 19768987 in words is "nineteen million, seven hundred sixty-eight thousand, nine hundred eighty-seven".