540637 has 4 divisors (see below), whose sum is σ = 544896. Its totient is φ = 536380.

The previous prime is 540629. The next prime is 540677. The reversal of 540637 is 736045.

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, and also an emirpimes, since its reverse is a distinct semiprime: 736045 = 5 ⋅147209.

It is a cyclic number.

It is not a de Polignac number, because 540637 - 2³ = 540629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540677) 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 in 3 ways as a sum of consecutive naturals, for example, 1933 + ... + 2194.

It is an arithmetic number, because the mean of its divisors is an integer number (136224).

2⁵⁴⁰⁶³⁷ is an apocalyptic number.

It is an amenable number.

540637 is a deficient number, since it is larger than the sum of its proper divisors (4259).

540637 is a wasteful number, since it uses less digits than its factorization.

540637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4258.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 540637 is about 735.2802186922. The cubic root of 540637 is about 81.4645359900.

The spelling of 540637 in words is "five hundred forty thousand, six hundred thirty-seven".