542689 has 4 divisors (see below), whose sum is σ = 620224. Its totient is φ = 465156.

The previous prime is 542687. The next prime is 542693. The reversal of 542689 is 986245.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 542689 - 2¹ = 542687 is a prime.

It is a super-2 number, since 2×542689² = 589022701442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542683) 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, 38757 + ... + 38770.

It is an arithmetic number, because the mean of its divisors is an integer number (155056).

2⁵⁴²⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

542689 is a deficient number, since it is larger than the sum of its proper divisors (77535).

542689 is an equidigital number, since it uses as much as digits as its factorization.

542689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77534.

The product of its digits is 17280, while the sum is 34.

The square root of 542689 is about 736.6742835202. The cubic root of 542689 is about 81.5674726983.

Subtracting 542689 from its reverse (986245), we obtain a square (443556 = 666²).

The spelling of 542689 in words is "five hundred forty-two thousand, six hundred eighty-nine".