540389 has 2 divisors, whose sum is σ = 540390. Its totient is φ = 540388.

The previous prime is 540383. The next prime is 540391. The reversal of 540389 is 983045.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330625 + 209764 = 575^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 540389 - 2⁴ = 540373 is a prime.

Together with 540391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (540383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270194 + 270195.

It is an arithmetic number, because the mean of its divisors is an integer number (270195).

2⁵⁴⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

540389 is a deficient number, since it is larger than the sum of its proper divisors (1).

540389 is an equidigital number, since it uses as much as digits as its factorization.

540389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 540389 is about 735.1115561600. Note that the first 3 decimals coincide. The cubic root of 540389 is about 81.4520776646.

It can be divided in two parts, 540 and 389, that added together give a palindrome (929).

The spelling of 540389 in words is "five hundred forty thousand, three hundred eighty-nine".