19986477839 has 16 divisors (see below), whose sum is σ = 21910331520. Its totient is φ = 18146849280.

The previous prime is 19986477817. The next prime is 19986477943. The reversal of 19986477839 is 93877468991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19986477839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19986477239) 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, 590417 + ... + 623349.

It is an arithmetic number, because the mean of its divisors is an integer number (1369395720).

Almost surely, 2^19986477839 is an apocalyptic number.

19986477839 is a deficient number, since it is larger than the sum of its proper divisors (1923853681).

19986477839 is a wasteful number, since it uses less digits than its factorization.

19986477839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34210.

The product of its digits is 164602368, while the sum is 71.

The spelling of 19986477839 in words is "nineteen billion, nine hundred eighty-six million, four hundred seventy-seven thousand, eight hundred thirty-nine".