540431 has 4 divisors (see below), whose sum is σ = 563952. Its totient is φ = 516912.

The previous prime is 540391. The next prime is 540433. The reversal of 540431 is 134045.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 540431 - 2⁶ = 540367 is a prime.

It is a super-2 number, since 2×540431² = 584131331522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540433) 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 in 3 ways as a sum of consecutive naturals, for example, 11726 + ... + 11771.

It is an arithmetic number, because the mean of its divisors is an integer number (140988).

2⁵⁴⁰⁴³¹ is an apocalyptic number.

540431 is a deficient number, since it is larger than the sum of its proper divisors (23521).

540431 is a wasteful number, since it uses less digits than its factorization.

540431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23520.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 540431 is about 735.1401226977. The cubic root of 540431 is about 81.4541878104.

Adding to 540431 its reverse (134045), we get a palindrome (674476).

The spelling of 540431 in words is "five hundred forty thousand, four hundred thirty-one".