442373861 has 2 divisors, whose sum is σ = 442373862. Its totient is φ = 442373860.

The previous prime is 442373821. The next prime is 442373873. The reversal of 442373861 is 168373244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437060836 + 5313025 = 20906^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 442373861 - 2²² = 438179557 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442373821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221186930 + 221186931.

It is an arithmetic number, because the mean of its divisors is an integer number (221186931).

Almost surely, 2^442373861 is an apocalyptic number.

It is an amenable number.

442373861 is a deficient number, since it is larger than the sum of its proper divisors (1).

442373861 is an equidigital number, since it uses as much as digits as its factorization.

442373861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 38.

The square root of 442373861 is about 21032.6855394170. The cubic root of 442373861 is about 761.9558700042.

The spelling of 442373861 in words is "four hundred forty-two million, three hundred seventy-three thousand, eight hundred sixty-one".