123218978 has 8 divisors (see below), whose sum is σ = 187055568. Its totient is φ = 60867124.

The previous prime is 123218923. The next prime is 123219013. The reversal of 123218978 is 879812321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370976 + ... + 371307.

It is an arithmetic number, because the mean of its divisors is an integer number (23381946).

Almost surely, 2^123218978 is an apocalyptic number.

123218978 is a deficient number, since it is larger than the sum of its proper divisors (63836590).

123218978 is an equidigital number, since it uses as much as digits as its factorization.

123218978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742368.

The product of its digits is 48384, while the sum is 41.

The square root of 123218978 is about 11100.4044070475. The cubic root of 123218978 is about 497.6139355052.

The spelling of 123218978 in words is "one hundred twenty-three million, two hundred eighteen thousand, nine hundred seventy-eight".