442043869 has 2 divisors, whose sum is σ = 442043870. Its totient is φ = 442043868.

The previous prime is 442043867. The next prime is 442043929. The reversal of 442043869 is 968340244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372104100 + 69939769 = 19290^2 + 8363^2 .

It is a cyclic number.

It is not a de Polignac number, because 442043869 - 2¹ = 442043867 is a prime.

It is a super-2 number, since 2×442043869² = 390805564240978322, which contains 22 as substring.

Together with 442043867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442043867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221021934 + 221021935.

It is an arithmetic number, because the mean of its divisors is an integer number (221021935).

Almost surely, 2^442043869 is an apocalyptic number.

It is an amenable number.

442043869 is a deficient number, since it is larger than the sum of its proper divisors (1).

442043869 is an equidigital number, since it uses as much as digits as its factorization.

442043869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 442043869 is about 21024.8393335122. The cubic root of 442043869 is about 761.7663606996.

The spelling of 442043869 in words is "four hundred forty-two million, forty-three thousand, eight hundred sixty-nine".