807817842 has 48 divisors (see below), whose sum is σ = 1895421528. Its totient is φ = 247173120.

The previous prime is 807817841. The next prime is 807817847. The reversal of 807817842 is 248718708.

It can be written as a sum of positive squares in 4 ways, for example, as 73462041 + 734355801 = 8571^2 + 27099^2 .

It is not an unprimeable number, because it can be changed into a prime (807817841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32818 + ... + 51890.

Almost surely, 2^807817842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 807817842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947710764).

807817842 is an abundant number, since it is smaller than the sum of its proper divisors (1087603686).

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

807817842 is a wasteful number, since it uses less digits than its factorization.

807817842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19275 (or 19272 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 807817842 is about 28422.1364784564. The cubic root of 807817842 is about 931.3319035992.

The spelling of 807817842 in words is "eight hundred seven million, eight hundred seventeen thousand, eight hundred forty-two".