7218766 has 4 divisors (see below), whose sum is σ = 10828152. Its totient is φ = 3609382.

The previous prime is 7218763. The next prime is 7218769. The reversal of 7218766 is 6678127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6678127 = 17 ⋅392831.

It is an interprime number because it is at equal distance from previous prime (7218763) and next prime (7218769).

It is a super-2 number, since 2×7218766² = 104221165125512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1804690 + ... + 1804693.

It is an arithmetic number, because the mean of its divisors is an integer number (2707038).

Almost surely, 2^7218766 is an apocalyptic number.

7218766 is a deficient number, since it is larger than the sum of its proper divisors (3609386).

7218766 is a wasteful number, since it uses less digits than its factorization.

7218766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609385.

The product of its digits is 28224, while the sum is 37.

The square root of 7218766 is about 2686.7761350734. The cubic root of 7218766 is about 193.2654941005.

The spelling of 7218766 in words is "seven million, two hundred eighteen thousand, seven hundred sixty-six".