2168981974 has 16 divisors (see below), whose sum is σ = 3447702000. Its totient is φ = 1020514464.

The previous prime is 2168981933. The next prime is 2168981977. The reversal of 2168981974 is 4791898612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168981977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185877 + ... + 197200.

It is an arithmetic number, because the mean of its divisors is an integer number (215481375).

Almost surely, 2^2168981974 is an apocalyptic number.

2168981974 is a deficient number, since it is larger than the sum of its proper divisors (1278720026).

2168981974 is a wasteful number, since it uses less digits than its factorization.

2168981974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383247.

The product of its digits is 1741824, while the sum is 55.

The square root of 2168981974 is about 46572.3305622555. The cubic root of 2168981974 is about 1294.4501024914.

The spelling of 2168981974 in words is "two billion, one hundred sixty-eight million, nine hundred eighty-one thousand, nine hundred seventy-four".