540731 has 4 divisors (see below), whose sum is σ = 544464. Its totient is φ = 537000.

The previous prime is 540713. The next prime is 540751. The reversal of 540731 is 137045.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137045 = 5 ⋅27409.

It is a cyclic number.

It is not a de Polignac number, because 540731 - 2¹⁴ = 524347 is a prime.

It is a super-2 number, since 2×540731² = 584780028722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640 + ... + 1941.

It is an arithmetic number, because the mean of its divisors is an integer number (136116).

2⁵⁴⁰⁷³¹ is an apocalyptic number.

540731 is a deficient number, since it is larger than the sum of its proper divisors (3733).

540731 is a wasteful number, since it uses less digits than its factorization.

540731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 540731 is about 735.3441371222. The cubic root of 540731 is about 81.4692571014.

Adding to 540731 its reverse (137045), we get a palindrome (677776).

The spelling of 540731 in words is "five hundred forty thousand, seven hundred thirty-one".