123899 has 4 divisors (see below), whose sum is σ = 130440. Its totient is φ = 117360.

The previous prime is 123887. The next prime is 123911. The reversal of 123899 is 998321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998321 = 647 ⋅1543.

It is an interprime number because it is at equal distance from previous prime (123887) and next prime (123911).

It is a cyclic number.

It is not a de Polignac number, because 123899 - 2¹⁶ = 58363 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123829) 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 3 ways as a sum of consecutive naturals, for example, 3242 + ... + 3279.

It is an arithmetic number, because the mean of its divisors is an integer number (32610).

2¹²³⁸⁹⁹ is an apocalyptic number.

123899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

123899 is a deficient number, since it is larger than the sum of its proper divisors (6541).

123899 is an equidigital number, since it uses as much as digits as its factorization.

123899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6540.

The product of its digits is 3888, while the sum is 32.

The square root of 123899 is about 351.9928976556. The cubic root of 123899 is about 49.8527668737.

The spelling of 123899 in words is "one hundred twenty-three thousand, eight hundred ninety-nine".