440420066 has 4 divisors (see below), whose sum is σ = 660630102. Its totient is φ = 220210032.

The previous prime is 440420047. The next prime is 440420081. The reversal of 440420066 is 660024044.

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., 395811025 + 44609041 = 19895^2 + 6679^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110105015 + ... + 110105018.

Almost surely, 2^440420066 is an apocalyptic number.

440420066 is a deficient number, since it is larger than the sum of its proper divisors (220210036).

440420066 is a wasteful number, since it uses less digits than its factorization.

440420066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220210035.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 440420066 is about 20986.1875051187. The cubic root of 440420066 is about 760.8324592622.

The spelling of 440420066 in words is "four hundred forty million, four hundred twenty thousand, sixty-six".