442391 has 8 divisors (see below), whose sum is σ = 478224. Its totient is φ = 407680.

The previous prime is 442367. The next prime is 442397. The reversal of 442391 is 193244.

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 442391 - 2⁶ = 442327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442397) 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, 656 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (59778).

2⁴⁴²³⁹¹ is an apocalyptic number.

442391 is a deficient number, since it is larger than the sum of its proper divisors (35833).

442391 is a wasteful number, since it uses less digits than its factorization.

442391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its digits is 864, while the sum is 23.

The square root of 442391 is about 665.1248003195. The cubic root of 442391 is about 76.1965710092.

The spelling of 442391 in words is "four hundred forty-two thousand, three hundred ninety-one".