1228979978 has 8 divisors (see below), whose sum is σ = 1843950720. Its totient is φ = 614329740.

The previous prime is 1228979897. The next prime is 1228979981. The reversal of 1228979978 is 8799798221.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228979978.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 70298 + ... + 86021.

It is an arithmetic number, because the mean of its divisors is an integer number (230493840).

Almost surely, 2^1228979978 is an apocalyptic number.

1228979978 is a deficient number, since it is larger than the sum of its proper divisors (614970742).

1228979978 is a wasteful number, since it uses less digits than its factorization.

1228979978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160252.

The product of its digits is 9144576, while the sum is 62.

The square root of 1228979978 is about 35056.8107220266. The cubic root of 1228979978 is about 1071.1450106357.

The spelling of 1228979978 in words is "one billion, two hundred twenty-eight million, nine hundred seventy-nine thousand, nine hundred seventy-eight".