7321806 has 16 divisors (see below), whose sum is σ = 16270800. Its totient is φ = 2440584.

The previous prime is 7321789. The next prime is 7321813. The reversal of 7321806 is 6081237.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 7321806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67741 + ... + 67848.

It is an arithmetic number, because the mean of its divisors is an integer number (1016925).

Almost surely, 2^7321806 is an apocalyptic number.

7321806 is an abundant number, since it is smaller than the sum of its proper divisors (8948994).

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

7321806 is a wasteful number, since it uses less digits than its factorization.

7321806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135600 (or 135594 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 7321806 is about 2705.8835895138. The cubic root of 7321806 is about 194.1807045505.

The spelling of 7321806 in words is "seven million, three hundred twenty-one thousand, eight hundred six".