1978266918 has 8 divisors (see below), whose sum is σ = 3956533848. Its totient is φ = 659422304.

The previous prime is 1978266893. The next prime is 1978266919. The reversal of 1978266918 is 8196628791.

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

1978266918 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978266919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164855571 + ... + 164855582.

It is an arithmetic number, because the mean of its divisors is an integer number (494566731).

Almost surely, 2^1978266918 is an apocalyptic number.

1978266918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1978266918 is a wasteful number, since it uses less digits than its factorization.

1978266918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329711158.

The product of its digits is 2612736, while the sum is 57.

The square root of 1978266918 is about 44477.7125985588. The cubic root of 1978266918 is about 1255.3407577201.

The spelling of 1978266918 in words is "one billion, nine hundred seventy-eight million, two hundred sixty-six thousand, nine hundred eighteen".