19842979867 has 16 divisors (see below), whose sum is σ = 20364618240. Its totient is φ = 19325728288.

The previous prime is 19842979829. The next prime is 19842979903. The reversal of 19842979867 is 76897924891.

It is a cyclic number.

It is not a de Polignac number, because 19842979867 - 2¹⁹ = 19842455579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19842979796 and 19842979805.

It is not an unprimeable number, because it can be changed into a prime (19842979817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15181428 + ... + 15182734.

It is an arithmetic number, because the mean of its divisors is an integer number (1272788640).

Almost surely, 2^19842979867 is an apocalyptic number.

19842979867 is a deficient number, since it is larger than the sum of its proper divisors (521638373).

19842979867 is a wasteful number, since it uses less digits than its factorization.

19842979867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690.

The product of its digits is 109734912, while the sum is 70.

The spelling of 19842979867 in words is "nineteen billion, eight hundred forty-two million, nine hundred seventy-nine thousand, eight hundred sixty-seven".