7220861 has 8 divisors (see below), whose sum is σ = 7628544. Its totient is φ = 6824160.

The previous prime is 7220849. The next prime is 7220867. The reversal of 7220861 is 1680227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7220861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7220861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220867) 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, 1376 + ... + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (953568).

Almost surely, 2^7220861 is an apocalyptic number.

It is an amenable number.

7220861 is a deficient number, since it is larger than the sum of its proper divisors (407683).

7220861 is a wasteful number, since it uses less digits than its factorization.

7220861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 7220861 is about 2687.1659792428. The cubic root of 7220861 is about 193.2841885259.

The spelling of 7220861 in words is "seven million, two hundred twenty thousand, eight hundred sixty-one".