442661 has 4 divisors (see below), whose sum is σ = 444000. Its totient is φ = 441324.

The previous prime is 442633. The next prime is 442691. The reversal of 442661 is 166244.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442661 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 (442601) 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, 230 + ... + 968.

It is an arithmetic number, because the mean of its divisors is an integer number (111000).

2⁴⁴²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

442661 is a deficient number, since it is larger than the sum of its proper divisors (1339).

442661 is an equidigital number, since it uses as much as digits as its factorization.

442661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338.

The product of its digits is 1152, while the sum is 23.

The square root of 442661 is about 665.3277387874. The cubic root of 442661 is about 76.2120692828.

The spelling of 442661 in words is "four hundred forty-two thousand, six hundred sixty-one".