123489891 has 24 divisors (see below), whose sum is σ = 207317760. Its totient is φ = 69367536.

The previous prime is 123489857. The next prime is 123489913. The reversal of 123489891 is 198984321.

It is not a de Polignac number, because 123489891 - 2¹¹ = 123487843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123489791) 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, 12895 + ... + 20328.

It is an arithmetic number, because the mean of its divisors is an integer number (8638240).

Almost surely, 2^123489891 is an apocalyptic number.

123489891 is a deficient number, since it is larger than the sum of its proper divisors (83827869).

123489891 is a wasteful number, since it uses less digits than its factorization.

123489891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33295 (or 33292 counting only the distinct ones).

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

The square root of 123489891 is about 11112.6005507262. The cubic root of 123489891 is about 497.9783582795.

It can be divided in two parts, 1234 and 89891, that added together give a cube (91125 = 45³).

The spelling of 123489891 in words is "one hundred twenty-three million, four hundred eighty-nine thousand, eight hundred ninety-one".