1921449782 has 8 divisors (see below), whose sum is σ = 3293913936. Its totient is φ = 823478472.

The previous prime is 1921449773. The next prime is 1921449787. The reversal of 1921449782 is 2879441291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921449787) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 68623193 + ... + 68623220.

It is an arithmetic number, because the mean of its divisors is an integer number (411739242).

Almost surely, 2^1921449782 is an apocalyptic number.

1921449782 is a deficient number, since it is larger than the sum of its proper divisors (1372464154).

1921449782 is a wasteful number, since it uses less digits than its factorization.

1921449782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137246422.

The product of its digits is 290304, while the sum is 47.

The square root of 1921449782 is about 43834.3447766703. The cubic root of 1921449782 is about 1243.2057576857.

The spelling of 1921449782 in words is "one billion, nine hundred twenty-one million, four hundred forty-nine thousand, seven hundred eighty-two".