539666021 has 8 divisors (see below), whose sum is σ = 544938240. Its totient is φ = 534419712.

The previous prime is 539665961. The next prime is 539666027. The reversal of 539666021 is 120666935.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 539666021 - 2¹⁴ = 539649637 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 (539666027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36770 + ... + 49308.

It is an arithmetic number, because the mean of its divisors is an integer number (68117280).

Almost surely, 2^539666021 is an apocalyptic number.

It is an amenable number.

539666021 is a deficient number, since it is larger than the sum of its proper divisors (5272219).

539666021 is a wasteful number, since it uses less digits than its factorization.

539666021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12955.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 539666021 is about 23230.7128818726. The cubic root of 539666021 is about 814.1573691560.

It can be divided in two parts, 5396 and 66021, that added together give a palindrome (71417).

The spelling of 539666021 in words is "five hundred thirty-nine million, six hundred sixty-six thousand, twenty-one".