445517218 has 4 divisors (see below), whose sum is σ = 668275830. Its totient is φ = 222758608.

The previous prime is 445517209. The next prime is 445517269. The reversal of 445517218 is 812715544.

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

It can be written as a sum of positive squares in only one way, i.e., 289442169 + 156075049 = 17013^2 + 12493^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 111379303 + ... + 111379306.

Almost surely, 2^445517218 is an apocalyptic number.

445517218 is a deficient number, since it is larger than the sum of its proper divisors (222758612).

445517218 is a wasteful number, since it uses less digits than its factorization.

445517218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222758611.

The product of its digits is 44800, while the sum is 37.

The square root of 445517218 is about 21107.2787919239. The cubic root of 445517218 is about 763.7563445944.

The spelling of 445517218 in words is "four hundred forty-five million, five hundred seventeen thousand, two hundred eighteen".