442255891 has 16 divisors (see below), whose sum is σ = 575359488. Its totient is φ = 329630400.

The previous prime is 442255873. The next prime is 442255909. The reversal of 442255891 is 198552244.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (442255873) and next prime (442255909).

It is not a de Polignac number, because 442255891 - 2²³ = 433867283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (442255861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123090 + ... + 126631.

It is an arithmetic number, because the mean of its divisors is an integer number (35959968).

Almost surely, 2^442255891 is an apocalyptic number.

442255891 is a deficient number, since it is larger than the sum of its proper divisors (133103597).

442255891 is a wasteful number, since it uses less digits than its factorization.

442255891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249762.

The product of its digits is 115200, while the sum is 40.

The square root of 442255891 is about 21029.8809078891. The cubic root of 442255891 is about 761.8881324837. Note that the first 3 decimals are identical.

The spelling of 442255891 in words is "four hundred forty-two million, two hundred fifty-five thousand, eight hundred ninety-one".