123155430 has 16 divisors (see below), whose sum is σ = 295573104. Its totient is φ = 32841440.

The previous prime is 123155419. The next prime is 123155437. The reversal of 123155430 is 34551321.

It is a self number, because there is not a number n which added to its sum of digits gives 123155430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123155437) 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 7 ways as a sum of consecutive naturals, for example, 2052561 + ... + 2052620.

It is an arithmetic number, because the mean of its divisors is an integer number (18473319).

Almost surely, 2^123155430 is an apocalyptic number.

123155430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123155430 is an abundant number, since it is smaller than the sum of its proper divisors (172417674).

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

123155430 is a wasteful number, since it uses less digits than its factorization.

123155430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105191.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 123155430 is about 11097.5416196561. The cubic root of 123155430 is about 497.5283756111.

The spelling of 123155430 in words is "one hundred twenty-three million, one hundred fifty-five thousand, four hundred thirty".