4429779921 has 48 divisors (see below), whose sum is σ = 7913278464. Its totient is φ = 2421224784.

The previous prime is 4429779919. The next prime is 4429779929. The reversal of 4429779921 is 1299779244.

4429779921 is a `hidden beast` number, since 442 + 97 + 7 + 99 + 21 = 666.

It is not a de Polignac number, because 4429779921 - 2¹ = 4429779919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4429779929) 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 47 ways as a sum of consecutive naturals, for example, 17491 + ... + 95736.

It is an arithmetic number, because the mean of its divisors is an integer number (164859968).

Almost surely, 2^4429779921 is an apocalyptic number.

It is an amenable number.

4429779921 is a deficient number, since it is larger than the sum of its proper divisors (3483498543).

4429779921 is a wasteful number, since it uses less digits than its factorization.

4429779921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113272 (or 113260 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 4429779921 is about 66556.5918673725. The cubic root of 4429779921 is about 1642.3310991644.

The spelling of 4429779921 in words is "four billion, four hundred twenty-nine million, seven hundred seventy-nine thousand, nine hundred twenty-one".