542439869 has 8 divisors (see below), whose sum is σ = 558026808. Its totient is φ = 526901760.

The previous prime is 542439853. The next prime is 542439899. The reversal of 542439869 is 968934245.

It can be written as a sum of positive squares in 4 ways, for example, as 60637369 + 481802500 = 7787^2 + 21950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 542439869 - 2⁴ = 542439853 is a prime.

It is a super-2 number, since 2×542439869² = 588482022961474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542439899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10949 + ... + 34709.

It is an arithmetic number, because the mean of its divisors is an integer number (69753351).

Almost surely, 2^542439869 is an apocalyptic number.

It is an amenable number.

542439869 is a deficient number, since it is larger than the sum of its proper divisors (15586939).

542439869 is a wasteful number, since it uses less digits than its factorization.

542439869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24415.

The product of its digits is 1866240, while the sum is 50.

The square root of 542439869 is about 23290.3385333919. The cubic root of 542439869 is about 815.5498912335.

The spelling of 542439869 in words is "five hundred forty-two million, four hundred thirty-nine thousand, eight hundred sixty-nine".