123900999 has 8 divisors (see below), whose sum is σ = 165265920. Its totient is φ = 82568376.

The previous prime is 123900961. The next prime is 123901007. The reversal of 123900999 is 999009321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123900999 - 2⁷ = 123900871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123900999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123900949) 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 7 ways as a sum of consecutive naturals, for example, 3082 + ... + 16040.

It is an arithmetic number, because the mean of its divisors is an integer number (20658240).

Almost surely, 2^123900999 is an apocalyptic number.

123900999 is a deficient number, since it is larger than the sum of its proper divisors (41364921).

123900999 is a wasteful number, since it uses less digits than its factorization.

123900999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16149.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 123900999 is about 11131.0825619074. The cubic root of 123900999 is about 498.5303498224.

The spelling of 123900999 in words is "one hundred twenty-three million, nine hundred thousand, nine hundred ninety-nine".