442191 has 4 divisors (see below), whose sum is σ = 589592. Its totient is φ = 294792.

The previous prime is 442181. The next prime is 442193. The reversal of 442191 is 191244.

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

It is a de Polignac number, because none of the positive numbers 2^k-442191 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 442191.

It is not an unprimeable number, because it can be changed into a prime (442193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73696 + ... + 73701.

It is an arithmetic number, because the mean of its divisors is an integer number (147398).

2⁴⁴²¹⁹¹ is an apocalyptic number.

442191 is a deficient number, since it is larger than the sum of its proper divisors (147401).

442191 is a wasteful number, since it uses less digits than its factorization.

442191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147400.

The product of its digits is 288, while the sum is 21.

The square root of 442191 is about 664.9744355988. The cubic root of 442191 is about 76.1850867406.

It can be divided in two parts, 4 and 42191, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 442191 in words is "four hundred forty-two thousand, one hundred ninety-one".