816442 has 32 divisors (see below), whose sum is σ = 1477440. Its totient is φ = 334080.

The previous prime is 816427. The next prime is 816443. The reversal of 816442 is 244618.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (816443) by changing a digit.

816442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13809 + ... + 13867.

It is an arithmetic number, because the mean of its divisors is an integer number (46170).

2⁸¹⁶⁴⁴² is an apocalyptic number.

816442 is a deficient number, since it is larger than the sum of its proper divisors (660998).

816442 is a wasteful number, since it uses less digits than its factorization.

816442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126.

The product of its digits is 1536, while the sum is 25.

The square root of 816442 is about 903.5718012422. The cubic root of 816442 is about 93.4634438198.

The spelling of 816442 in words is "eight hundred sixteen thousand, four hundred forty-two".