123978192 has 80 divisors (see below), whose sum is σ = 363101760. Its totient is φ = 36135936.

The previous prime is 123978167. The next prime is 123978193. The reversal of 123978192 is 291879321.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123978193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6628 + ... + 17084.

It is an arithmetic number, because the mean of its divisors is an integer number (4538772).

Almost surely, 2^123978192 is an apocalyptic number.

123978192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123978192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181550880).

123978192 is an abundant number, since it is smaller than the sum of its proper divisors (239123568).

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

123978192 is a wasteful number, since it uses less digits than its factorization.

123978192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500 (or 10494 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 123978192 is about 11134.5494744960. The cubic root of 123978192 is about 498.6338600562.

The spelling of 123978192 in words is "one hundred twenty-three million, nine hundred seventy-eight thousand, one hundred ninety-two".