2193989778 has 24 divisors (see below), whose sum is σ = 4754926800. Its totient is φ = 731132664.

The previous prime is 2193989767. The next prime is 2193989779. The reversal of 2193989778 is 8779893912.

It is a super-2 number, since 2×2193989778² = 9627182291936978568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2193989779) 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 11 ways as a sum of consecutive naturals, for example, 62353 + ... + 90971.

It is an arithmetic number, because the mean of its divisors is an integer number (198121950).

Almost surely, 2^2193989778 is an apocalyptic number.

2193989778 is an abundant number, since it is smaller than the sum of its proper divisors (2560937022).

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

2193989778 is a wasteful number, since it uses less digits than its factorization.

2193989778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32886 (or 32883 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 2193989778 is about 46840.0445986124. The cubic root of 2193989778 is about 1299.4059964759.

The spelling of 2193989778 in words is "two billion, one hundred ninety-three million, nine hundred eighty-nine thousand, seven hundred seventy-eight".