123165420 has 72 divisors (see below), whose sum is σ = 401176944. Its totient is φ = 28151424.

The previous prime is 123165403. The next prime is 123165421. The reversal of 123165420 is 24561321.

It is not an unprimeable number, because it can be changed into a prime (123165421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18007 + ... + 23886.

It is an arithmetic number, because the mean of its divisors is an integer number (5571902).

Almost surely, 2^123165420 is an apocalyptic number.

123165420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123165420 is an abundant number, since it is smaller than the sum of its proper divisors (278011524).

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

123165420 is a wasteful number, since it uses less digits than its factorization.

123165420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41919 (or 41910 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 123165420 is about 11097.9917102150. The cubic root of 123165420 is about 497.5418279184.

The spelling of 123165420 in words is "one hundred twenty-three million, one hundred sixty-five thousand, four hundred twenty".