442009869 has 16 divisors (see below), whose sum is σ = 675231360. Its totient is φ = 251942400.

The previous prime is 442009847. The next prime is 442009879. The reversal of 442009869 is 968900244.

It is not a de Polignac number, because 442009869 - 2⁸ = 442009613 is a prime.

It is a super-2 number, since 2×442009869² = 390745448586794322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 442009869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442009829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17824 + ... + 34665.

It is an arithmetic number, because the mean of its divisors is an integer number (42201960).

Almost surely, 2^442009869 is an apocalyptic number.

It is an amenable number.

442009869 is a deficient number, since it is larger than the sum of its proper divisors (233221491).

442009869 is a wasteful number, since it uses less digits than its factorization.

442009869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52900.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 442009869 is about 21024.0307505483. The cubic root of 442009869 is about 761.7468296665.

The spelling of 442009869 in words is "four hundred forty-two million, nine thousand, eight hundred sixty-nine".