15423193891 has 24 divisors (see below), whose sum is σ = 18071290944. Its totient is φ = 13124442240.

The previous prime is 15423193889. The next prime is 15423193921. The reversal of 15423193891 is 19839132451.

15423193891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15423193891 - 2¹ = 15423193889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15423193871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4032406 + ... + 4036228.

It is an arithmetic number, because the mean of its divisors is an integer number (752970456).

Almost surely, 2^15423193891 is an apocalyptic number.

15423193891 is a deficient number, since it is larger than the sum of its proper divisors (2648097053).

15423193891 is a wasteful number, since it uses less digits than its factorization.

15423193891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411 (or 4404 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The spelling of 15423193891 in words is "fifteen billion, four hundred twenty-three million, one hundred ninety-three thousand, eight hundred ninety-one".