2146981918 has 16 divisors (see below), whose sum is σ = 3410817984. Its totient is φ = 1010076160.

The previous prime is 2146981891. The next prime is 2146981961. The reversal of 2146981918 is 8191896412.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 188646 + ... + 199702.

It is an arithmetic number, because the mean of its divisors is an integer number (213176124).

Almost surely, 2^2146981918 is an apocalyptic number.

2146981918 is a deficient number, since it is larger than the sum of its proper divisors (1263836066).

2146981918 is a wasteful number, since it uses less digits than its factorization.

2146981918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16787.

The product of its digits is 248832, while the sum is 49.

The square root of 2146981918 is about 46335.5362330037. The cubic root of 2146981918 is about 1290.0586712894.

It can be divided in two parts, 2146 and 981918, that added together give a square (984064 = 992²).

The spelling of 2146981918 in words is "two billion, one hundred forty-six million, nine hundred eighty-one thousand, nine hundred eighteen".