442121903 has 4 divisors (see below), whose sum is σ = 451528800. Its totient is φ = 432715008.

The previous prime is 442121881. The next prime is 442121909. The reversal of 442121903 is 309121244.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 442121903 - 2¹² = 442117807 is a prime.

It is a super-2 number, since 2×442121903² = 390943554224682818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442121909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4703378 + ... + 4703471.

It is an arithmetic number, because the mean of its divisors is an integer number (112882200).

Almost surely, 2^442121903 is an apocalyptic number.

442121903 is a deficient number, since it is larger than the sum of its proper divisors (9406897).

442121903 is an equidigital number, since it uses as much as digits as its factorization.

442121903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9406896.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 442121903 is about 21026.6950089642. The cubic root of 442121903 is about 761.8111829317.

The spelling of 442121903 in words is "four hundred forty-two million, one hundred twenty-one thousand, nine hundred three".