7861806 has 16 divisors (see below), whose sum is σ = 17470800. Its totient is φ = 2620584.

The previous prime is 7861793. The next prime is 7861807. The reversal of 7861806 is 6081687.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7861807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72741 + ... + 72848.

It is an arithmetic number, because the mean of its divisors is an integer number (1091925).

Almost surely, 2^7861806 is an apocalyptic number.

7861806 is an abundant number, since it is smaller than the sum of its proper divisors (9608994).

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

7861806 is a wasteful number, since it uses less digits than its factorization.

7861806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145600 (or 145594 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 7861806 is about 2803.8912247090. The cubic root of 7861806 is about 198.8416878489.

The spelling of 7861806 in words is "seven million, eight hundred sixty-one thousand, eight hundred six".