123420100 has 36 divisors (see below), whose sum is σ = 269021844. Its totient is φ = 49146880.

The previous prime is 123420071. The next prime is 123420137. The reversal of 123420100 is 1024321.

It can be written as a sum of positive squares in 6 ways, for example, as 2067844 + 121352256 = 1438^2 + 11016^2 .

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, 20652 + ... + 25948.

It is an arithmetic number, because the mean of its divisors is an integer number (7472829).

Almost surely, 2^123420100 is an apocalyptic number.

123420100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123420100 is an abundant number, since it is smaller than the sum of its proper divisors (145601744).

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

123420100 is a wasteful number, since it uses less digits than its factorization.

123420100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544 (or 5537 counting only the distinct ones).

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

The square root of 123420100 is about 11109.4599328680. The cubic root of 123420100 is about 497.8845288532.

Adding to 123420100 its reverse (1024321), we get a palindrome (124444421).

The spelling of 123420100 in words is "one hundred twenty-three million, four hundred twenty thousand, one hundred".