4445623921 has 4 divisors (see below), whose sum is σ = 4540211712. Its totient is φ = 4351036132.

The previous prime is 4445623907. The next prime is 4445623937. The reversal of 4445623921 is 1293265444.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4445623921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4445623901) 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 3 ways as a sum of consecutive naturals, for example, 47293825 + ... + 47293918.

It is an arithmetic number, because the mean of its divisors is an integer number (1135052928).

Almost surely, 2^4445623921 is an apocalyptic number.

It is an amenable number.

4445623921 is a deficient number, since it is larger than the sum of its proper divisors (94587791).

4445623921 is an equidigital number, since it uses as much as digits as its factorization.

4445623921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94587790.

The product of its digits is 207360, while the sum is 40.

The square root of 4445623921 is about 66675.5121540135. The cubic root of 4445623921 is about 1644.2868119891.

The spelling of 4445623921 in words is "four billion, four hundred forty-five million, six hundred twenty-three thousand, nine hundred twenty-one".