538921540 has 12 divisors (see below), whose sum is σ = 1131735276. Its totient is φ = 215568608.

The previous prime is 538921531. The next prime is 538921541. The reversal of 538921540 is 45129835.

It can be written as a sum of positive squares in 2 ways, for example, as 217149696 + 321771844 = 14736^2 + 17938^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 538921540.

It is not an unprimeable number, because it can be changed into a prime (538921541) 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, 13473019 + ... + 13473058.

It is an arithmetic number, because the mean of its divisors is an integer number (94311273).

Almost surely, 2^538921540 is an apocalyptic number.

It is an amenable number.

538921540 is an abundant number, since it is smaller than the sum of its proper divisors (592813736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

538921540 is a wasteful number, since it uses less digits than its factorization.

538921540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26946086 (or 26946084 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 538921540 is about 23214.6837152695. The cubic root of 538921540 is about 813.7828142750.

The spelling of 538921540 in words is "five hundred thirty-eight million, nine hundred twenty-one thousand, five hundred forty".