540909 has 6 divisors (see below), whose sum is σ = 781326. Its totient is φ = 360600.

The previous prime is 540907. The next prime is 540961. The reversal of 540909 is 909045.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 459684 + 81225 = 678^2 + 285^2 .

It is not a de Polignac number, because 540909 - 2¹ = 540907 is a prime.

It is an Ulam number.

540909 is a modest number, since divided by 909 gives 54 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30042 + ... + 30059.

It is an arithmetic number, because the mean of its divisors is an integer number (130221).

2⁵⁴⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

540909 is a deficient number, since it is larger than the sum of its proper divisors (240417).

540909 is a wasteful number, since it uses less digits than its factorization.

540909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60107 (or 60104 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 540909 is about 735.4651589300. The cubic root of 540909 is about 81.4781955797.

The spelling of 540909 in words is "five hundred forty thousand, nine hundred nine".