1978908912 has 120 divisors (see below), whose sum is σ = 5665780224. Its totient is φ = 644547072.

The previous prime is 1978908887. The next prime is 1978908917. The reversal of 1978908912 is 2198098791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978908917) 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 23 ways as a sum of consecutive naturals, for example, 2922718 + ... + 2923394.

Almost surely, 2^1978908912 is an apocalyptic number.

1978908912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978908912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2832890112).

1978908912 is an abundant number, since it is smaller than the sum of its proper divisors (3686871312).

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

1978908912 is a wasteful number, since it uses less digits than its factorization.

1978908912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 1978908912 is about 44484.9290434412. The cubic root of 1978908912 is about 1255.4765388699.

The spelling of 1978908912 in words is "one billion, nine hundred seventy-eight million, nine hundred eight thousand, nine hundred twelve".