123989719 has 16 divisors (see below), whose sum is σ = 143712256. Its totient is φ = 104781600.

The previous prime is 123989717. The next prime is 123989729. The reversal of 123989719 is 917989321.

It is not a de Polignac number, because 123989719 - 2¹ = 123989717 is a prime.

It is a super-2 number, since 2×123989719² = 30746900835397922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123989717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187249 + ... + 187909.

It is an arithmetic number, because the mean of its divisors is an integer number (8982016).

Almost surely, 2^123989719 is an apocalyptic number.

123989719 is a deficient number, since it is larger than the sum of its proper divisors (19722537).

123989719 is a wasteful number, since it uses less digits than its factorization.

123989719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006.

The product of its digits is 244944, while the sum is 49.

The square root of 123989719 is about 11135.0670855635. The cubic root of 123989719 is about 498.6493132427.

The spelling of 123989719 in words is "one hundred twenty-three million, nine hundred eighty-nine thousand, seven hundred nineteen".