489123891 has 24 divisors (see below), whose sum is σ = 727490400. Its totient is φ = 316483200.

The previous prime is 489123853. The next prime is 489123907. The reversal of 489123891 is 198321984.

It is not a de Polignac number, because 489123891 - 2⁷ = 489123763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (489123851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70101 + ... + 76761.

It is an arithmetic number, because the mean of its divisors is an integer number (30312100).

Almost surely, 2^489123891 is an apocalyptic number.

489123891 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

489123891 is a deficient number, since it is larger than the sum of its proper divisors (238366509).

489123891 is a wasteful number, since it uses less digits than its factorization.

489123891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6907 (or 6904 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 489123891 is about 22116.1454824298. The cubic root of 489123891 is about 787.9033712798.

It can be divided in two parts, 4891 and 23891, that added together give a palindrome (28782).

The spelling of 489123891 in words is "four hundred eighty-nine million, one hundred twenty-three thousand, eight hundred ninety-one".