19539142387 has 4 divisors (see below), whose sum is σ = 19597122376. Its totient is φ = 19481162400.

The previous prime is 19539142331. The next prime is 19539142411. The reversal of 19539142387 is 78324193591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19539142387 - 2¹¹ = 19539140339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19539142307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28989489 + ... + 28990162.

It is an arithmetic number, because the mean of its divisors is an integer number (4899280594).

Almost surely, 2^19539142387 is an apocalyptic number.

19539142387 is a deficient number, since it is larger than the sum of its proper divisors (57979989).

19539142387 is an equidigital number, since it uses as much as digits as its factorization.

19539142387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57979988.

The product of its digits is 1632960, while the sum is 52.

The spelling of 19539142387 in words is "nineteen billion, five hundred thirty-nine million, one hundred forty-two thousand, three hundred eighty-seven".