123775 has 6 divisors (see below), whose sum is σ = 153512. Its totient is φ = 99000.

The previous prime is 123757. The next prime is 123787. The reversal of 123775 is 577321.

It is not a de Polignac number, because 123775 - 2¹¹ = 121727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 4951 = 123775 / (1 + 2 + 3 + 7 + 7 + 5).

It is a Duffinian number.

123775 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2451 + ... + 2500.

2¹²³⁷⁷⁵ is an apocalyptic number.

123775 is a deficient number, since it is larger than the sum of its proper divisors (29737).

123775 is an equidigital number, since it uses as much as digits as its factorization.

123775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961 (or 4956 counting only the distinct ones).

The product of its digits is 1470, while the sum is 25.

The square root of 123775 is about 351.8167136450. The cubic root of 123775 is about 49.8361301871.

It can be divided in two parts, 123 and 775, that added together give a palindrome (898).

The spelling of 123775 in words is "one hundred twenty-three thousand, seven hundred seventy-five".