8406842 has 4 divisors (see below), whose sum is σ = 12610266. Its totient is φ = 4203420.

The previous prime is 8406841. The next prime is 8406847. The reversal of 8406842 is 2486048.

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., 8059921 + 346921 = 2839^2 + 589^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8406799 and 8406808.

It is not an unprimeable number, because it can be changed into a prime (8406841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2101709 + ... + 2101712.

Almost surely, 2^8406842 is an apocalyptic number.

8406842 is a deficient number, since it is larger than the sum of its proper divisors (4203424).

8406842 is a wasteful number, since it uses less digits than its factorization.

8406842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203423.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 8406842 is about 2899.4554661177. The cubic root of 8406842 is about 203.3344483202.

The spelling of 8406842 in words is "eight million, four hundred six thousand, eight hundred forty-two".