7856906 has 4 divisors (see below), whose sum is σ = 11785362. Its totient is φ = 3928452.

The previous prime is 7856887. The next prime is 7856909. The reversal of 7856906 is 6096587.

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., 5248681 + 2608225 = 2291^2 + 1615^2 .

It is a super-3 number, since 3×7856906³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7856909) by changing a digit.

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 as a sum of consecutive naturals, namely, 1964225 + ... + 1964228.

Almost surely, 2^7856906 is an apocalyptic number.

7856906 is a deficient number, since it is larger than the sum of its proper divisors (3928456).

7856906 is a wasteful number, since it uses less digits than its factorization.

7856906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3928455.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 7856906 is about 2803.0173028364. The cubic root of 7856906 is about 198.8003688118.

The spelling of 7856906 in words is "seven million, eight hundred fifty-six thousand, nine hundred six".