122745 has 24 divisors (see below), whose sum is σ = 229824. Its totient is φ = 55776.

The previous prime is 122743. The next prime is 122753. The reversal of 122745 is 547221.

It is not a de Polignac number, because 122745 - 2¹ = 122743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (122741) 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 23 ways as a sum of consecutive naturals, for example, 652 + ... + 818.

It is an arithmetic number, because the mean of its divisors is an integer number (9576).

2¹²²⁷⁴⁵ is an apocalyptic number.

122745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

122745 is a deficient number, since it is larger than the sum of its proper divisors (107079).

122745 is a wasteful number, since it uses less digits than its factorization.

122745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 182 counting only the distinct ones).

The product of its digits is 560, while the sum is 21.

The square root of 122745 is about 350.3498251748. The cubic root of 122745 is about 49.6975069833.

Adding to 122745 its reverse (547221), we get a palindrome (669966).

The spelling of 122745 in words is "one hundred twenty-two thousand, seven hundred forty-five".