445378817 has 8 divisors (see below), whose sum is σ = 480852456. Its totient is φ = 410078592.

The previous prime is 445378789. The next prime is 445378819. The reversal of 445378817 is 718873544.

It is a happy number.

It is a Cunningham number, because it is equal to 21104²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 445378816 = 1^2 + 21104^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 445378817 - 2¹⁴ = 445362433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445378819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37988 + ... + 48309.

It is an arithmetic number, because the mean of its divisors is an integer number (60106557).

Almost surely, 2^445378817 is an apocalyptic number.

It is an amenable number.

445378817 is a deficient number, since it is larger than the sum of its proper divisors (35473639).

445378817 is a wasteful number, since it uses less digits than its factorization.

445378817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86707.

The product of its digits is 752640, while the sum is 47.

The square root of 445378817 is about 21104.0000236922. Note that the first 4 decimals coincide. The cubic root of 445378817 is about 763.6772488189.

The spelling of 445378817 in words is "four hundred forty-five million, three hundred seventy-eight thousand, eight hundred seventeen".