440347409 has 2 divisors, whose sum is σ = 440347410. Its totient is φ = 440347408.

The previous prime is 440347333. The next prime is 440347423. The reversal of 440347409 is 904743044.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324720400 + 115627009 = 18020^2 + 10753^2 .

It is a cyclic number.

It is not a de Polignac number, because 440347409 - 2¹⁶ = 440281873 is a prime.

It is a super-2 number, since 2×440347409² = 387811681226026562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (440347429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220173704 + 220173705.

It is an arithmetic number, because the mean of its divisors is an integer number (220173705).

Almost surely, 2^440347409 is an apocalyptic number.

It is an amenable number.

440347409 is a deficient number, since it is larger than the sum of its proper divisors (1).

440347409 is an equidigital number, since it uses as much as digits as its factorization.

440347409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 440347409 is about 20984.4563665586. The cubic root of 440347409 is about 760.7906182651.

The spelling of 440347409 in words is "four hundred forty million, three hundred forty-seven thousand, four hundred nine".