816985442 has 32 divisors (see below), whose sum is σ = 1509715200. Its totient is φ = 322895808.

The previous prime is 816985417. The next prime is 816985489. The reversal of 816985442 is 244589618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340784 + ... + 343172.

It is an arithmetic number, because the mean of its divisors is an integer number (47178600).

Almost surely, 2^816985442 is an apocalyptic number.

816985442 is a deficient number, since it is larger than the sum of its proper divisors (692729758).

816985442 is a wasteful number, since it uses less digits than its factorization.

816985442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290.

The product of its digits is 552960, while the sum is 47.

The square root of 816985442 is about 28582.9571948040. The cubic root of 816985442 is about 934.8417633790.

The spelling of 816985442 in words is "eight hundred sixteen million, nine hundred eighty-five thousand, four hundred forty-two".