540405621 has 16 divisors (see below), whose sum is σ = 914972800. Its totient is φ = 308803104.

The previous prime is 540405601. The next prime is 540405629. The reversal of 540405621 is 126504045.

It is not a de Polignac number, because 540405621 - 2⁵ = 540405589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540405629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1429456 + ... + 1429833.

It is an arithmetic number, because the mean of its divisors is an integer number (57185800).

Almost surely, 2^540405621 is an apocalyptic number.

It is an amenable number.

540405621 is a deficient number, since it is larger than the sum of its proper divisors (374567179).

540405621 is a wasteful number, since it uses less digits than its factorization.

540405621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859305 (or 2859299 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 540405621 is about 23246.6260132519. The cubic root of 540405621 is about 814.5291274275.

Adding to 540405621 its reverse (126504045), we get a palindrome (666909666).

The spelling of 540405621 in words is "five hundred forty million, four hundred five thousand, six hundred twenty-one".