540401 has 4 divisors (see below), whose sum is σ = 543600. Its totient is φ = 537204.

The previous prime is 540391. The next prime is 540433. The reversal of 540401 is 104045.

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: 104045 = 5 ⋅20809.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (540461) 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, 1331 + ... + 1688.

It is an arithmetic number, because the mean of its divisors is an integer number (135900).

2⁵⁴⁰⁴⁰¹ is an apocalyptic number.

It is an amenable number.

540401 is a deficient number, since it is larger than the sum of its proper divisors (3199).

540401 is a wasteful number, since it uses less digits than its factorization.

540401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 540401 is about 735.1197181412. The cubic root of 540401 is about 81.4526805746.

Adding to 540401 its reverse (104045), we get a palindrome (644446).

The spelling of 540401 in words is "five hundred forty thousand, four hundred one".