459040021 has 4 divisors (see below), whose sum is σ = 500770944. Its totient is φ = 417309100.

The previous prime is 459039991. The next prime is 459040031. The reversal of 459040021 is 120040954.

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 cyclic number.

It is not a de Polignac number, because 459040021 - 2⁹ = 459039509 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 (459040031) 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, 20865445 + ... + 20865466.

It is an arithmetic number, because the mean of its divisors is an integer number (125192736).

Almost surely, 2^459040021 is an apocalyptic number.

It is an amenable number.

459040021 is a deficient number, since it is larger than the sum of its proper divisors (41730923).

459040021 is a wasteful number, since it uses less digits than its factorization.

459040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41730922.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 459040021 is about 21425.2192754240. The cubic root of 459040021 is about 771.4068959926.

Adding to 459040021 its reverse (120040954), we get a palindrome (579080975).

The spelling of 459040021 in words is "four hundred fifty-nine million, forty thousand, twenty-one".