442978 has 4 divisors (see below), whose sum is σ = 664470. Its totient is φ = 221488.

The previous prime is 442973. The next prime is 442979. The reversal of 442978 is 879244.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 368449 + 74529 = 607^2 + 273^2 .

It is a d-powerful number, because it can be written as 4⁶ + 4⁹ + 9⁵ + 2⁵ + 7⁶ + 8 .

It is not an unprimeable number, because it can be changed into a prime (442973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110743 + ... + 110746.

2⁴⁴²⁹⁷⁸ is an apocalyptic number.

442978 is a deficient number, since it is larger than the sum of its proper divisors (221492).

442978 is a wasteful number, since it uses less digits than its factorization.

442978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221491.

The product of its digits is 16128, while the sum is 34.

The square root of 442978 is about 665.5659246085. The cubic root of 442978 is about 76.2302573629.

The spelling of 442978 in words is "four hundred forty-two thousand, nine hundred seventy-eight".