978123942 has 24 divisors (see below), whose sum is σ = 2133309360. Its totient is φ = 323881200.

The previous prime is 978123911. The next prime is 978123943. The reversal of 978123942 is 249321879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978123943) 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 11 ways as a sum of consecutive naturals, for example, 177217 + ... + 182652.

It is an arithmetic number, because the mean of its divisors is an integer number (88887890).

Almost surely, 2^978123942 is an apocalyptic number.

978123942 is an abundant number, since it is smaller than the sum of its proper divisors (1155185418).

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

978123942 is a wasteful number, since it uses less digits than its factorization.

978123942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360028 (or 360025 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 978123942 is about 31274.9730935136. The cubic root of 978123942 is about 992.6541513046.

The spelling of 978123942 in words is "nine hundred seventy-eight million, one hundred twenty-three thousand, nine hundred forty-two".