442369 has 4 divisors (see below), whose sum is σ = 444244. Its totient is φ = 440496.

The previous prime is 442367. The next prime is 442397. The reversal of 442369 is 963244.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82369 + 360000 = 287^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 442369 - 2¹ = 442367 is a prime.

It is a super-2 number, since 2×442369² = 391380664322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522 + ... + 1075.

It is an arithmetic number, because the mean of its divisors is an integer number (111061).

442369 is a Friedman number, since it can be written as 4/4+96^3/2, using all its digits and the basic arithmetic operations.

It is a Proth number, since it is equal to 27 ⋅ 2¹⁴ + 1 and 27 < 2¹⁴.

2⁴⁴²³⁶⁹ is an apocalyptic number.

It is an amenable number.

442369 is a deficient number, since it is larger than the sum of its proper divisors (1875).

442369 is a wasteful number, since it uses less digits than its factorization.

442369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874.

The product of its digits is 5184, while the sum is 28.

The square root of 442369 is about 665.1082618642. The cubic root of 442369 is about 76.1953079091.

The spelling of 442369 in words is "four hundred forty-two thousand, three hundred sixty-nine".