123217506 has 12 divisors (see below), whose sum is σ = 266971302. Its totient is φ = 41072496.

The previous prime is 123217441. The next prime is 123217531. The reversal of 123217506 is 605712321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 106936281 + 16281225 = 10341^2 + 4035^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 123217506.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3422691 + ... + 3422726.

Almost surely, 2^123217506 is an apocalyptic number.

123217506 is an abundant number, since it is smaller than the sum of its proper divisors (143753796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123217506 is a wasteful number, since it uses less digits than its factorization.

123217506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6845425 (or 6845422 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 123217506 is about 11100.3381029588. The cubic root of 123217506 is about 497.6119539635.

Adding to 123217506 its reverse (605712321), we get a palindrome (728929827).

The spelling of 123217506 in words is "one hundred twenty-three million, two hundred seventeen thousand, five hundred six".