421540539 has 16 divisors (see below), whose sum is σ = 644675328. Its totient is φ = 240007392.

The previous prime is 421540523. The next prime is 421540661. The reversal of 421540539 is 935045124.

It is not a de Polignac number, because 421540539 - 2⁴ = 421540523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421545539) 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 15 ways as a sum of consecutive naturals, for example, 30417 + ... + 42050.

It is an arithmetic number, because the mean of its divisors is an integer number (40292208).

Almost surely, 2^421540539 is an apocalyptic number.

421540539 is a deficient number, since it is larger than the sum of its proper divisors (223134789).

421540539 is a wasteful number, since it uses less digits than its factorization.

421540539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72754.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 421540539 is about 20531.4524327920. The cubic root of 421540539 is about 749.8017484886.

The spelling of 421540539 in words is "four hundred twenty-one million, five hundred forty thousand, five hundred thirty-nine".