402243869 has 2 divisors, whose sum is σ = 402243870. Its totient is φ = 402243868.

The previous prime is 402243839. The next prime is 402243883. The reversal of 402243869 is 968342204.

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., 272580100 + 129663769 = 16510^2 + 11387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402243869 is a prime.

It is a super-2 number, since 2×402243869² = 323600260296178322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402243839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201121934 + 201121935.

It is an arithmetic number, because the mean of its divisors is an integer number (201121935).

Almost surely, 2^402243869 is an apocalyptic number.

It is an amenable number.

402243869 is a deficient number, since it is larger than the sum of its proper divisors (1).

402243869 is an equidigital number, since it uses as much as digits as its factorization.

402243869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 402243869 is about 20056.0182738249. The cubic root of 402243869 is about 738.1814788356.

The spelling of 402243869 in words is "four hundred two million, two hundred forty-three thousand, eight hundred sixty-nine".