540406521 has 12 divisors (see below), whose sum is σ = 782158000. Its totient is φ = 359546040.

The previous prime is 540406513. The next prime is 540406583. The reversal of 540406521 is 125604045.

540406521 is a `hidden beast` number, since 5 + 4 + 0 + 4 + 0 + 652 + 1 = 666.

It is not a de Polignac number, because 540406521 - 2³ = 540406513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540406511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55675 + ... + 64656.

Almost surely, 2^540406521 is an apocalyptic number.

It is an amenable number.

540406521 is a deficient number, since it is larger than the sum of its proper divisors (241751479).

540406521 is a wasteful number, since it uses less digits than its factorization.

540406521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120836 (or 120833 counting only the distinct ones).

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

The square root of 540406521 is about 23246.6453708917. The cubic root of 540406521 is about 814.5295796038.

The spelling of 540406521 in words is "five hundred forty million, four hundred six thousand, five hundred twenty-one".