538480021 has 4 divisors (see below), whose sum is σ = 540575532. Its totient is φ = 536384512.

The previous prime is 538479971. The next prime is 538480027. The reversal of 538480021 is 120084835.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 534256996 + 4223025 = 23114^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 538480021 - 2²⁹ = 1609109 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 (538480027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1047370 + ... + 1047883.

It is an arithmetic number, because the mean of its divisors is an integer number (135143883).

Almost surely, 2^538480021 is an apocalyptic number.

It is an amenable number.

538480021 is a deficient number, since it is larger than the sum of its proper divisors (2095511).

538480021 is a wasteful number, since it uses less digits than its factorization.

538480021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095510.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 538480021 is about 23205.1722898150. The cubic root of 538480021 is about 813.5605192449.

The spelling of 538480021 in words is "five hundred thirty-eight million, four hundred eighty thousand, twenty-one".