540989 has 2 divisors, whose sum is σ = 540990. Its totient is φ = 540988.

The previous prime is 540961. The next prime is 541001. The reversal of 540989 is 989045.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444889 + 96100 = 667^2 + 310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540989 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (540389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270494 + 270495.

It is an arithmetic number, because the mean of its divisors is an integer number (270495).

2⁵⁴⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

540989 is a deficient number, since it is larger than the sum of its proper divisors (1).

540989 is an equidigital number, since it uses as much as digits as its factorization.

540989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 540989 is about 735.5195442679. The cubic root of 540989 is about 81.4822122345.

The spelling of 540989 in words is "five hundred forty thousand, nine hundred eighty-nine".