2191404782 has 16 divisors (see below), whose sum is σ = 3757339872. Its totient is φ = 939012000.

The previous prime is 2191404781. The next prime is 2191404793. The reversal of 2191404782 is 2874041912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191404781) 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 7 ways as a sum of consecutive naturals, for example, 109808 + ... + 128220.

It is an arithmetic number, because the mean of its divisors is an integer number (234833742).

Almost surely, 2^2191404782 is an apocalyptic number.

2191404782 is a deficient number, since it is larger than the sum of its proper divisors (1565935090).

2191404782 is a wasteful number, since it uses less digits than its factorization.

2191404782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26923.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 2191404782 is about 46812.4425980956. The cubic root of 2191404782 is about 1298.8954685182.

The spelling of 2191404782 in words is "two billion, one hundred ninety-one million, four hundred four thousand, seven hundred eighty-two".