123215530 has 16 divisors (see below), whose sum is σ = 224913024. Its totient is φ = 48591760.

The previous prime is 123215509. The next prime is 123215549. The reversal of 123215530 is 35512321.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86062 + ... + 87481.

It is an arithmetic number, because the mean of its divisors is an integer number (14057064).

Almost surely, 2^123215530 is an apocalyptic number.

123215530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123215530 is a deficient number, since it is larger than the sum of its proper divisors (101697494).

123215530 is a wasteful number, since it uses less digits than its factorization.

123215530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173621.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 123215530 is about 11100.2490963041. The cubic root of 123215530 is about 497.6092939344.

Adding to 123215530 its reverse (35512321), we get a palindrome (158727851).

The spelling of 123215530 in words is "one hundred twenty-three million, two hundred fifteen thousand, five hundred thirty".