445544399 has 4 divisors (see below), whose sum is σ = 445606320. Its totient is φ = 445482480.

The previous prime is 445544389. The next prime is 445544401. The reversal of 445544399 is 993445544.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445544399 is a prime.

It is a super-2 number, since 2×445544399² = 397019622960542402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445544329) 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, 18494 + ... + 35115.

It is an arithmetic number, because the mean of its divisors is an integer number (111401580).

Almost surely, 2^445544399 is an apocalyptic number.

445544399 is a deficient number, since it is larger than the sum of its proper divisors (61921).

445544399 is an equidigital number, since it uses as much as digits as its factorization.

445544399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61920.

The product of its digits is 1555200, while the sum is 47.

The square root of 445544399 is about 21107.9226595134. The cubic root of 445544399 is about 763.7718765336.

The spelling of 445544399 in words is "four hundred forty-five million, five hundred forty-four thousand, three hundred ninety-nine".