42443239 has 2 divisors, whose sum is σ = 42443240. Its totient is φ = 42443238.

The previous prime is 42443197. The next prime is 42443249. The reversal of 42443239 is 93234424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42443239 - 2¹³ = 42435047 is a prime.

It is a super-2 number, since 2×42443239² = 3602857073622242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42443239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42443249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221619 + 21221620.

It is an arithmetic number, because the mean of its divisors is an integer number (21221620).

Almost surely, 2^42443239 is an apocalyptic number.

42443239 is a deficient number, since it is larger than the sum of its proper divisors (1).

42443239 is an equidigital number, since it uses as much as digits as its factorization.

42443239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 31.

The square root of 42443239 is about 6514.8475807190. The cubic root of 42443239 is about 348.8211742215.

The spelling of 42443239 in words is "forty-two million, four hundred forty-three thousand, two hundred thirty-nine".