19542879 has 6 divisors (see below), whose sum is σ = 28228616. Its totient is φ = 13028580.

The previous prime is 19542871. The next prime is 19542899. The reversal of 19542879 is 97824591.

It is not a de Polignac number, because 19542879 - 2³ = 19542871 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 (19542871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1085707 + ... + 1085724.

Almost surely, 2^19542879 is an apocalyptic number.

19542879 is a deficient number, since it is larger than the sum of its proper divisors (8685737).

19542879 is a wasteful number, since it uses less digits than its factorization.

19542879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171437 (or 2171434 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 19542879 is about 4420.7328577963. The cubic root of 19542879 is about 269.3577740145.

The spelling of 19542879 in words is "nineteen million, five hundred forty-two thousand, eight hundred seventy-nine".