402442244209 has 2 divisors, whose sum is σ = 402442244210. Its totient is φ = 402442244208.

The previous prime is 402442244189. The next prime is 402442244221. The reversal of 402442244209 is 902442244204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264093210000 + 138349034209 = 513900^2 + 371953^2 .

It is a cyclic number.

It is not a de Polignac number, because 402442244209 - 2¹³ = 402442236017 is a prime.

It is not a weakly prime, because it can be changed into another prime (402442244909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201221122104 + 201221122105.

It is an arithmetic number, because the mean of its divisors is an integer number (201221122105).

Almost surely, 2^402442244209 is an apocalyptic number.

It is an amenable number.

402442244209 is a deficient number, since it is larger than the sum of its proper divisors (1).

402442244209 is an equidigital number, since it uses as much as digits as its factorization.

402442244209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147456, while the sum is 37.

It can be divided in two parts, 40244 and 2244209, that added together give a triangular number (2284453 = T₂₁₃₇).

The spelling of 402442244209 in words is "four hundred two billion, four hundred forty-two million, two hundred forty-four thousand, two hundred nine".