123215 has 8 divisors (see below), whose sum is σ = 155760. Its totient is φ = 93312.

The previous prime is 123209. The next prime is 123217. The reversal of 123215 is 512321.

123215 = 49² + 50² + ... + 78².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123215 - 2¹⁶ = 57679 is a prime.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 123215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (19470).

2¹²³²¹⁵ is an apocalyptic number.

123215 is a deficient number, since it is larger than the sum of its proper divisors (32545).

123215 is a wasteful number, since it uses less digits than its factorization.

123215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321.

The product of its digits is 60, while the sum is 14.

The square root of 123215 is about 351.0199424534. The cubic root of 123215 is about 49.7608580460.

Subtracting from 123215 its sum of digits (14), we obtain a square (123201 = 351²).

Adding to 123215 its reverse (512321), we get a palindrome (635536).

The spelling of 123215 in words is "one hundred twenty-three thousand, two hundred fifteen".