442940403 has 18 divisors (see below), whose sum is σ = 613117804. Its totient is φ = 284430608.

The previous prime is 442940383. The next prime is 442940411. The reversal of 442940403 is 304049244.

It is not a de Polignac number, because 442940403 - 2⁶ = 442940339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442940413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1056928 + ... + 1057346.

Almost surely, 2^442940403 is an apocalyptic number.

442940403 is a deficient number, since it is larger than the sum of its proper divisors (170177401).

442940403 is an frugal number, since it uses more digits than its factorization.

442940403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 442940403 is about 21046.1493627694. The cubic root of 442940403 is about 762.2810066434.

Adding to 442940403 its reverse (304049244), we get a palindrome (746989647).

The spelling of 442940403 in words is "four hundred forty-two million, nine hundred forty thousand, four hundred three".