809966442 has 32 divisors (see below), whose sum is σ = 1632337920. Its totient is φ = 267928880.

The previous prime is 809966401. The next prime is 809966449. The reversal of 809966442 is 244669908.

It is a super-2 number, since 2×809966442² = 1312091274332278728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 809966391 and 809966400.

It is not an unprimeable number, because it can be changed into a prime (809966449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 823483 + ... + 824465.

It is an arithmetic number, because the mean of its divisors is an integer number (51010560).

Almost surely, 2^809966442 is an apocalyptic number.

809966442 is an abundant number, since it is smaller than the sum of its proper divisors (822371478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809966442 is a wasteful number, since it uses less digits than its factorization.

809966442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 809966442 is about 28459.9093814439. The cubic root of 809966442 is about 932.1568784592.

The spelling of 809966442 in words is "eight hundred nine million, nine hundred sixty-six thousand, four hundred forty-two".