489957391 has 16 divisors (see below), whose sum is σ = 646790400. Its totient is φ = 359326080.

The previous prime is 489957361. The next prime is 489957397. The reversal of 489957391 is 193759984.

It is a cyclic number.

It is not a de Polignac number, because 489957391 - 2⁵ = 489957359 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 (489957397) 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 15 ways as a sum of consecutive naturals, for example, 185841 + ... + 188458.

It is an arithmetic number, because the mean of its divisors is an integer number (40424400).

Almost surely, 2^489957391 is an apocalyptic number.

489957391 is a deficient number, since it is larger than the sum of its proper divisors (156833009).

489957391 is a wasteful number, since it uses less digits than its factorization.

489957391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374334.

The product of its digits is 2449440, while the sum is 55.

The square root of 489957391 is about 22134.9811610491. The cubic root of 489957391 is about 788.3506640786.

The spelling of 489957391 in words is "four hundred eighty-nine million, nine hundred fifty-seven thousand, three hundred ninety-one".