123126289 has 16 divisors (see below), whose sum is σ = 152268480. Its totient is φ = 97882560.

The previous prime is 123126281. The next prime is 123126317. The reversal of 123126289 is 982621321.

It is a cyclic number.

It is not a de Polignac number, because 123126289 - 2³ = 123126281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123126281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19942 + ... + 25375.

It is an arithmetic number, because the mean of its divisors is an integer number (9516780).

Almost surely, 2^123126289 is an apocalyptic number.

123126289 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

123126289 is a deficient number, since it is larger than the sum of its proper divisors (29142191).

123126289 is a wasteful number, since it uses less digits than its factorization.

123126289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45360.

The product of its digits is 10368, while the sum is 34.

The square root of 123126289 is about 11096.2285935357. The cubic root of 123126289 is about 497.4891308451.

The spelling of 123126289 in words is "one hundred twenty-three million, one hundred twenty-six thousand, two hundred eighty-nine".