442140407 has 2 divisors, whose sum is σ = 442140408. Its totient is φ = 442140406.

The previous prime is 442140379. The next prime is 442140463. The reversal of 442140407 is 704041244.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442140407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442140497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221070203 + 221070204.

It is an arithmetic number, because the mean of its divisors is an integer number (221070204).

Almost surely, 2^442140407 is an apocalyptic number.

442140407 is a deficient number, since it is larger than the sum of its proper divisors (1).

442140407 is an equidigital number, since it uses as much as digits as its factorization.

442140407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 442140407 is about 21027.1350164496. The cubic root of 442140407 is about 761.8218107377.

The spelling of 442140407 in words is "four hundred forty-two million, one hundred forty thousand, four hundred seven".