123400120 has 32 divisors (see below), whose sum is σ = 278056800. Its totient is φ = 49287808.

The previous prime is 123400111. The next prime is 123400157. The reversal of 123400120 is 21004321.

It is a self number, because there is not a number n which added to its sum of digits gives 123400120.

It is a congruent number.

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, 31722 + ... + 35398.

It is an arithmetic number, because the mean of its divisors is an integer number (8689275).

Almost surely, 2^123400120 is an apocalyptic number.

123400120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123400120 is an abundant number, since it is smaller than the sum of its proper divisors (154656680).

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

123400120 is a wasteful number, since it uses less digits than its factorization.

123400120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527 (or 4523 counting only the distinct ones).

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

The square root of 123400120 is about 11108.5606628402. The cubic root of 123400120 is about 497.8576605400.

Adding to 123400120 its reverse (21004321), we get a palindrome (144404441).

The spelling of 123400120 in words is "one hundred twenty-three million, four hundred thousand, one hundred twenty".