538680021 has 12 divisors (see below), whose sum is σ = 789470976. Its totient is φ = 326472520.

The previous prime is 538680013. The next prime is 538680143. The reversal of 538680021 is 120086835.

It is a happy number.

It is not a de Polignac number, because 538680021 - 2³ = 538680013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538680011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 741621 + ... + 742346.

It is an arithmetic number, because the mean of its divisors is an integer number (65789248).

Almost surely, 2^538680021 is an apocalyptic number.

It is an amenable number.

538680021 is a deficient number, since it is larger than the sum of its proper divisors (250790955).

538680021 is a wasteful number, since it uses less digits than its factorization.

538680021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483992 (or 1483981 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 538680021 is about 23209.4812738243. The cubic root of 538680021 is about 813.6612298607.

The spelling of 538680021 in words is "five hundred thirty-eight million, six hundred eighty thousand, twenty-one".