539433781 has 8 divisors (see below), whose sum is σ = 546367640. Its totient is φ = 532528128.

The previous prime is 539433779. The next prime is 539433787. The reversal of 539433781 is 187334935.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 70711281 + 468722500 = 8409^2 + 21650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 539433781 - 2¹ = 539433779 is a prime.

It is a super-2 number, since 2×539433781² = 581977608167911922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (539433787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32875 + ... + 46471.

It is an arithmetic number, because the mean of its divisors is an integer number (68295955).

Almost surely, 2^539433781 is an apocalyptic number.

It is an amenable number.

539433781 is a deficient number, since it is larger than the sum of its proper divisors (6933859).

539433781 is a wasteful number, since it uses less digits than its factorization.

539433781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14103.

The product of its digits is 272160, while the sum is 43.

The square root of 539433781 is about 23225.7137888161. The cubic root of 539433781 is about 814.0405641757.

The spelling of 539433781 in words is "five hundred thirty-nine million, four hundred thirty-three thousand, seven hundred eighty-one".