539402391 has 48 divisors (see below), whose sum is σ = 880877088. Its totient is φ = 317813760.

The previous prime is 539402323. The next prime is 539402393. The reversal of 539402391 is 193204935.

It is a happy number.

It is not a de Polignac number, because 539402391 - 2¹⁰ = 539401367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (539402393) 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 47 ways as a sum of consecutive naturals, for example, 442615 + ... + 443831.

It is an arithmetic number, because the mean of its divisors is an integer number (18351606).

Almost surely, 2^539402391 is an apocalyptic number.

539402391 is a deficient number, since it is larger than the sum of its proper divisors (341474697).

539402391 is a wasteful number, since it uses less digits than its factorization.

539402391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293 (or 1268 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 539402391 is about 23225.0380193446. The cubic root of 539402391 is about 814.0247740208.

The spelling of 539402391 in words is "five hundred thirty-nine million, four hundred two thousand, three hundred ninety-one".