445385639 has 4 divisors (see below), whose sum is σ = 464750256. Its totient is φ = 426021024.

The previous prime is 445385623. The next prime is 445385653. The reversal of 445385639 is 936583544.

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 445385639 - 2⁴ = 445385623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 445385593 and 445385602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445381639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9682274 + ... + 9682319.

It is an arithmetic number, because the mean of its divisors is an integer number (116187564).

Almost surely, 2^445385639 is an apocalyptic number.

445385639 is a deficient number, since it is larger than the sum of its proper divisors (19364617).

445385639 is a wasteful number, since it uses less digits than its factorization.

445385639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19364616.

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

The square root of 445385639 is about 21104.1616512005. The cubic root of 445385639 is about 763.6811479563.

The spelling of 445385639 in words is "four hundred forty-five million, three hundred eighty-five thousand, six hundred thirty-nine".