540005421 has 4 divisors (see below), whose sum is σ = 720007232. Its totient is φ = 360003612.

The previous prime is 540005407. The next prime is 540005423. The reversal of 540005421 is 124500045.

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.

It is a de Polignac number, because none of the positive numbers 2^k-540005421 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 (540005423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90000901 + ... + 90000906.

It is an arithmetic number, because the mean of its divisors is an integer number (180001808).

Almost surely, 2^540005421 is an apocalyptic number.

It is an amenable number.

540005421 is a deficient number, since it is larger than the sum of its proper divisors (180001811).

540005421 is a wasteful number, since it uses less digits than its factorization.

540005421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180001810.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 540005421 is about 23238.0167183002. The cubic root of 540005421 is about 814.3280099430.

Adding to 540005421 its reverse (124500045), we get a palindrome (664505466).

The spelling of 540005421 in words is "five hundred forty million, five thousand, four hundred twenty-one".