538305221 has 16 divisors (see below), whose sum is σ = 590768640. Its totient is φ = 488221440.

The previous prime is 538305217. The next prime is 538305223. The reversal of 538305221 is 122503835.

It is a cyclic number.

It is not a de Polignac number, because 538305221 - 2² = 538305217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538305223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436676 + ... + 437906.

It is an arithmetic number, because the mean of its divisors is an integer number (36923040).

Almost surely, 2^538305221 is an apocalyptic number.

It is an amenable number.

538305221 is a deficient number, since it is larger than the sum of its proper divisors (52463419).

538305221 is a wasteful number, since it uses less digits than its factorization.

538305221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 538305221 is about 23201.4055824211. The cubic root of 538305221 is about 813.4724777429.

The spelling of 538305221 in words is "five hundred thirty-eight million, three hundred five thousand, two hundred twenty-one".