123178820 has 12 divisors (see below), whose sum is σ = 258675564. Its totient is φ = 49271520.

The previous prime is 123178807. The next prime is 123178849. The reversal of 123178820 is 28871321.

It can be written as a sum of positive squares in 2 ways, for example, as 31899904 + 91278916 = 5648^2 + 9554^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3079451 + ... + 3079490.

It is an arithmetic number, because the mean of its divisors is an integer number (21556297).

Almost surely, 2^123178820 is an apocalyptic number.

123178820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123178820 is an abundant number, since it is smaller than the sum of its proper divisors (135496744).

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

123178820 is a wasteful number, since it uses less digits than its factorization.

123178820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6158950 (or 6158948 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 123178820 is about 11098.5954066269. The cubic root of 123178820 is about 497.5598709122.

The spelling of 123178820 in words is "one hundred twenty-three million, one hundred seventy-eight thousand, eight hundred twenty".