123420138 has 16 divisors (see below), whose sum is σ = 247803840. Its totient is φ = 40979456.

The previous prime is 123420137. The next prime is 123420169. The reversal of 123420138 is 831024321.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123420137) 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, 38478 + ... + 41561.

It is an arithmetic number, because the mean of its divisors is an integer number (15487740).

Almost surely, 2^123420138 is an apocalyptic number.

123420138 is an abundant number, since it is smaller than the sum of its proper divisors (124383702).

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

123420138 is a wasteful number, since it uses less digits than its factorization.

123420138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80301.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 123420138 is about 11109.4616431220. The cubic root of 123420138 is about 497.8845799514.

Adding to 123420138 its reverse (831024321), we get a palindrome (954444459).

The spelling of 123420138 in words is "one hundred twenty-three million, four hundred twenty thousand, one hundred thirty-eight".