442026139 has 2 divisors, whose sum is σ = 442026140. Its totient is φ = 442026138.

The previous prime is 442026131. The next prime is 442026157. The reversal of 442026139 is 931620244.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442026139 - 2³ = 442026131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442026139.

It is not a weakly prime, because it can be changed into another prime (442026131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221013069 + 221013070.

It is an arithmetic number, because the mean of its divisors is an integer number (221013070).

Almost surely, 2^442026139 is an apocalyptic number.

442026139 is a deficient number, since it is larger than the sum of its proper divisors (1).

442026139 is an equidigital number, since it uses as much as digits as its factorization.

442026139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 442026139 is about 21024.4176851584. The cubic root of 442026139 is about 761.7561759652.

The spelling of 442026139 in words is "four hundred forty-two million, twenty-six thousand, one hundred thirty-nine".