19864023439 has 16 divisors (see below), whose sum is σ = 23635184832. Its totient is φ = 16507104768.

The previous prime is 19864023427. The next prime is 19864023467. The reversal of 19864023439 is 93432046891.

It is a cyclic number.

It is not a de Polignac number, because 19864023439 - 2⁵ = 19864023407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19864023392 and 19864023401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19864023479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1948884 + ... + 1959049.

It is an arithmetic number, because the mean of its divisors is an integer number (1477199052).

Almost surely, 2^19864023439 is an apocalyptic number.

19864023439 is a deficient number, since it is larger than the sum of its proper divisors (3771161393).

19864023439 is a wasteful number, since it uses less digits than its factorization.

19864023439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907986.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 19864023439 in words is "nineteen billion, eight hundred sixty-four million, twenty-three thousand, four hundred thirty-nine".