19840987919 has 8 divisors (see below), whose sum is σ = 19897320240. Its totient is φ = 19784704896.

The previous prime is 19840987879. The next prime is 19840987949. The reversal of 19840987919 is 91978904891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19840987919 is a prime.

It is a super-2 number, since 2×19840987919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19840987949) 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, 884804 + ... + 906950.

It is an arithmetic number, because the mean of its divisors is an integer number (2487165030).

Almost surely, 2^19840987919 is an apocalyptic number.

19840987919 is a deficient number, since it is larger than the sum of its proper divisors (56332321).

19840987919 is a wasteful number, since it uses less digits than its factorization.

19840987919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24649.

The product of its (nonzero) digits is 11757312, while the sum is 65.

The spelling of 19840987919 in words is "nineteen billion, eight hundred forty million, nine hundred eighty-seven thousand, nine hundred nineteen".