123100420 has 12 divisors (see below), whose sum is σ = 258510924. Its totient is φ = 49240160.

The previous prime is 123100387. The next prime is 123100423. The reversal of 123100420 is 24001321.

It can be written as a sum of positive squares in 2 ways, for example, as 71605444 + 51494976 = 8462^2 + 7176^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 123100420.

It is not an unprimeable number, because it can be changed into a prime (123100423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3077491 + ... + 3077530.

It is an arithmetic number, because the mean of its divisors is an integer number (21542577).

Almost surely, 2^123100420 is an apocalyptic number.

123100420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123100420 is an abundant number, since it is smaller than the sum of its proper divisors (135410504).

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

123100420 is a wasteful number, since it uses less digits than its factorization.

123100420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6155030 (or 6155028 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 123100420 is about 11095.0628659778. The cubic root of 123100420 is about 497.4542873581.

Adding to 123100420 its reverse (24001321), we get a palindrome (147101741).

Subtracting from 123100420 its reverse (24001321), we obtain a palindrome (99099099).

The spelling of 123100420 in words is "one hundred twenty-three million, one hundred thousand, four hundred twenty".