1538678393923 has 24 divisors (see below), whose sum is σ = 1701296578800. Its totient is φ = 1390529268480.

The previous prime is 1538678393881. The next prime is 1538678393951. The reversal of 1538678393923 is 3293938768351.

It is not a de Polignac number, because 1538678393923 - 2⁹ = 1538678393411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1538678393963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17407383 + ... + 17495551.

It is an arithmetic number, because the mean of its divisors is an integer number (70887357450).

Almost surely, 2^{1538678393923} is an apocalyptic number.

1538678393923 is a deficient number, since it is larger than the sum of its proper divisors (162618184877).

1538678393923 is a wasteful number, since it uses less digits than its factorization.

1538678393923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89043 (or 89032 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 67.

The spelling of 1538678393923 in words is "one trillion, five hundred thirty-eight billion, six hundred seventy-eight million, three hundred ninety-three thousand, nine hundred twenty-three".