2194436640 has 144 divisors (see below), whose sum is σ = 7598211264. Its totient is φ = 531970560.

The previous prime is 2194436593. The next prime is 2194436659. The reversal of 2194436640 is 466344912.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 39189 + ... + 76971.

It is an arithmetic number, because the mean of its divisors is an integer number (52765356).

Almost surely, 2^2194436640 is an apocalyptic number.

2194436640 is a gapful number since it is divisible by the number (20) 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 2194436640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3799105632).

2194436640 is an abundant number, since it is smaller than the sum of its proper divisors (5403774624).

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

2194436640 is a wasteful number, since it uses less digits than its factorization.

2194436640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37823 (or 37804 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 2194436640 is about 46844.8144408749. The cubic root of 2194436640 is about 1299.4942095495.

It can be divided in two parts, 2194 and 436640, that added together give a palindrome (438834).

The spelling of 2194436640 in words is "two billion, one hundred ninety-four million, four hundred thirty-six thousand, six hundred forty".