442991243 has 2 divisors, whose sum is σ = 442991244. Its totient is φ = 442991242.

The previous prime is 442991233. The next prime is 442991257. The reversal of 442991243 is 342199244.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442991243 - 2⁶ = 442991179 is a prime.

It is a super-3 number, since 3×442991243³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 442991197 and 442991206.

It is not a weakly prime, because it can be changed into another prime (442991233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221495621 + 221495622.

It is an arithmetic number, because the mean of its divisors is an integer number (221495622).

Almost surely, 2^442991243 is an apocalyptic number.

442991243 is a deficient number, since it is larger than the sum of its proper divisors (1).

442991243 is an equidigital number, since it uses as much as digits as its factorization.

442991243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 442991243 is about 21047.3571500082. The cubic root of 442991243 is about 762.3101699978.

The spelling of 442991243 in words is "four hundred forty-two million, nine hundred ninety-one thousand, two hundred forty-three".