123644225 has 12 divisors (see below), whose sum is σ = 153470460. Its totient is φ = 98817600.

The previous prime is 123644207. The next prime is 123644231. The reversal of 123644225 is 522446321.

It can be written as a sum of positive squares in 6 ways, for example, as 35509681 + 88134544 = 5959^2 + 9388^2 .

It is not a de Polignac number, because 123644225 - 2¹⁸ = 123382081 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33995 + ... + 37455.

It is an arithmetic number, because the mean of its divisors is an integer number (12789205).

Almost surely, 2^123644225 is an apocalyptic number.

It is an amenable number.

123644225 is a deficient number, since it is larger than the sum of its proper divisors (29826235).

123644225 is a wasteful number, since it uses less digits than its factorization.

123644225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900 (or 4895 counting only the distinct ones).

The product of its digits is 11520, while the sum is 29.

The square root of 123644225 is about 11119.5424815952. The cubic root of 123644225 is about 498.1857247733.

The spelling of 123644225 in words is "one hundred twenty-three million, six hundred forty-four thousand, two hundred twenty-five".