123212538 has 24 divisors (see below), whose sum is σ = 275573376. Its totient is φ = 39745800.

The previous prime is 123212513. The next prime is 123212567. The reversal of 123212538 is 835212321.

123212538 is a `hidden beast` number, since 123 + 2 + 1 + 2 + 538 = 666.

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, 109848 + ... + 110963.

It is an arithmetic number, because the mean of its divisors is an integer number (11482224).

Almost surely, 2^123212538 is an apocalyptic number.

123212538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123212538 is an abundant number, since it is smaller than the sum of its proper divisors (152360838).

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

123212538 is a wasteful number, since it uses less digits than its factorization.

123212538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220850 (or 220847 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 123212538 is about 11100.1143237356. The cubic root of 123212538 is about 497.6052661438.

Adding to 123212538 its reverse (835212321), we get a palindrome (958424859).

The spelling of 123212538 in words is "one hundred twenty-three million, two hundred twelve thousand, five hundred thirty-eight".