123138930 has 32 divisors (see below), whose sum is σ = 305726400. Its totient is φ = 31704512.

The previous prime is 123138929. The next prime is 123138947. The reversal of 123138930 is 39831321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 69900 + ... + 71639.

It is an arithmetic number, because the mean of its divisors is an integer number (9553950).

Almost surely, 2^123138930 is an apocalyptic number.

123138930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123138930 is an abundant number, since it is smaller than the sum of its proper divisors (182587470).

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

123138930 is a wasteful number, since it uses less digits than its factorization.

123138930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141578.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 123138930 is about 11096.7981868645. The cubic root of 123138930 is about 497.5061554923.

The spelling of 123138930 in words is "one hundred twenty-three million, one hundred thirty-eight thousand, nine hundred thirty".