540422989 has 2 divisors, whose sum is σ = 540422990. Its totient is φ = 540422988.

The previous prime is 540422977. The next prime is 540423029. The reversal of 540422989 is 989224045.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395413225 + 145009764 = 19885^2 + 12042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540422989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (540422929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270211494 + 270211495.

It is an arithmetic number, because the mean of its divisors is an integer number (270211495).

Almost surely, 2^540422989 is an apocalyptic number.

It is an amenable number.

540422989 is a deficient number, since it is larger than the sum of its proper divisors (1).

540422989 is an equidigital number, since it uses as much as digits as its factorization.

540422989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 540422989 is about 23246.9995698370. Note that the first 3 decimals coincide. The cubic root of 540422989 is about 814.5378533362.

The spelling of 540422989 in words is "five hundred forty million, four hundred twenty-two thousand, nine hundred eighty-nine".