442026389 has 8 divisors (see below), whose sum is σ = 505318848. Its totient is φ = 378770400.

The previous prime is 442026257. The next prime is 442026391. The reversal of 442026389 is 983620244.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 442026389 - 2¹² = 442022293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442026989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25769 + ... + 39345.

It is an arithmetic number, because the mean of its divisors is an integer number (63164856).

Almost surely, 2^442026389 is an apocalyptic number.

It is an amenable number.

442026389 is a deficient number, since it is larger than the sum of its proper divisors (63292459).

442026389 is a wasteful number, since it uses less digits than its factorization.

442026389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18235.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 442026389 is about 21024.4236306254. The cubic root of 442026389 is about 761.7563195759.

The spelling of 442026389 in words is "four hundred forty-two million, twenty-six thousand, three hundred eighty-nine".