540861 has 4 divisors (see below), whose sum is σ = 721152. Its totient is φ = 360572.

The previous prime is 540851. The next prime is 540863. The reversal of 540861 is 168045.

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 540861 - 2⁹ = 540349 is a prime.

It is a D-number.

It is a Curzon number.

540861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540863) 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, 90141 + ... + 90146.

It is an arithmetic number, because the mean of its divisors is an integer number (180288).

2⁵⁴⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

540861 is a deficient number, since it is larger than the sum of its proper divisors (180291).

540861 is a wasteful number, since it uses less digits than its factorization.

540861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180290.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 540861 is about 735.4325257969. The cubic root of 540861 is about 81.4757853966.

Subtracting from 540861 its reverse (168045), we obtain a triangular number (372816 = T₈₆₃).

The spelling of 540861 in words is "five hundred forty thousand, eight hundred sixty-one".