538866391 has 16 divisors (see below), whose sum is σ = 686396160. Its totient is φ = 411834240.

The previous prime is 538866373. The next prime is 538866401. The reversal of 538866391 is 193668835.

538866391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 538866391 - 2¹⁵ = 538833623 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 (538866091) 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, 116905 + ... + 121426.

It is an arithmetic number, because the mean of its divisors is an integer number (42899760).

Almost surely, 2^538866391 is an apocalyptic number.

538866391 is a deficient number, since it is larger than the sum of its proper divisors (147529769).

538866391 is a wasteful number, since it uses less digits than its factorization.

538866391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238374.

The product of its digits is 933120, while the sum is 49.

The square root of 538866391 is about 23213.4958806294. The cubic root of 538866391 is about 813.7550546130.

The spelling of 538866391 in words is "five hundred thirty-eight million, eight hundred sixty-six thousand, three hundred ninety-one".