440081209 has 2 divisors, whose sum is σ = 440081210. Its totient is φ = 440081208.

The previous prime is 440081197. The next prime is 440081251. The reversal of 440081209 is 902180044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358269184 + 81812025 = 18928^2 + 9045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440081209 is a prime.

It is not a weakly prime, because it can be changed into another prime (440081009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220040604 + 220040605.

It is an arithmetic number, because the mean of its divisors is an integer number (220040605).

Almost surely, 2^440081209 is an apocalyptic number.

It is an amenable number.

440081209 is a deficient number, since it is larger than the sum of its proper divisors (1).

440081209 is an equidigital number, since it uses as much as digits as its factorization.

440081209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 440081209 is about 20978.1126176785. The cubic root of 440081209 is about 760.6372822990.

The spelling of 440081209 in words is "four hundred forty million, eighty-one thousand, two hundred nine".