542391 has 4 divisors (see below), whose sum is σ = 723192. Its totient is φ = 361592.

The previous prime is 542371. The next prime is 542401. The reversal of 542391 is 193245.

542391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 542391 - 2⁷ = 542263 is a prime.

It is a D-number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542371) 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, 90396 + ... + 90401.

It is an arithmetic number, because the mean of its divisors is an integer number (180798).

2⁵⁴²³⁹¹ is an apocalyptic number.

542391 is a deficient number, since it is larger than the sum of its proper divisors (180801).

542391 is a wasteful number, since it uses less digits than its factorization.

542391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180800.

The product of its digits is 1080, while the sum is 24.

The square root of 542391 is about 736.4719953943. The cubic root of 542391 is about 81.5525399238.

The spelling of 542391 in words is "five hundred forty-two thousand, three hundred ninety-one".