4394505391 has 4 divisors (see below), whose sum is σ = 4399050832. Its totient is φ = 4389959952.

The previous prime is 4394505371. The next prime is 4394505407. The reversal of 4394505391 is 1935054934.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4394505391 - 2⁵ = 4394505359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4394505361) 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, 2271270 + ... + 2273203.

It is an arithmetic number, because the mean of its divisors is an integer number (1099762708).

Almost surely, 2^4394505391 is an apocalyptic number.

4394505391 is a deficient number, since it is larger than the sum of its proper divisors (4545441).

4394505391 is an equidigital number, since it uses as much as digits as its factorization.

4394505391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545440.

The product of its (nonzero) digits is 291600, while the sum is 43.

The square root of 4394505391 is about 66291.0656951599. The cubic root of 4394505391 is about 1637.9601585860.

The spelling of 4394505391 in words is "four billion, three hundred ninety-four million, five hundred five thousand, three hundred ninety-one".