8781842 has 4 divisors (see below), whose sum is σ = 13172766. Its totient is φ = 4390920.

The previous prime is 8781797. The next prime is 8781853. The reversal of 8781842 is 2481878.

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., 8708401 + 73441 = 2951^2 + 271^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8781796 and 8781805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2195459 + ... + 2195462.

Almost surely, 2^8781842 is an apocalyptic number.

8781842 is a deficient number, since it is larger than the sum of its proper divisors (4390924).

8781842 is a wasteful number, since it uses less digits than its factorization.

8781842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4390923.

The product of its digits is 28672, while the sum is 38.

The square root of 8781842 is about 2963.4172841502. The cubic root of 8781842 is about 206.3139242321.

The spelling of 8781842 in words is "eight million, seven hundred eighty-one thousand, eight hundred forty-two".