7218765 has 24 divisors (see below), whose sum is σ = 13172640. Its totient is φ = 3646944.

The previous prime is 7218763. The next prime is 7218769. The reversal of 7218765 is 5678127.

7218765 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7218765 - 2¹ = 7218763 is a prime.

It is a super-2 number, since 2×7218765² = 104221136250450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

7218765 is a lucky number.

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 in 23 ways as a sum of consecutive naturals, for example, 3367 + ... + 5076.

It is an arithmetic number, because the mean of its divisors is an integer number (548860).

Almost surely, 2^7218765 is an apocalyptic number.

It is an amenable number.

7218765 is a deficient number, since it is larger than the sum of its proper divisors (5953875).

7218765 is a wasteful number, since it uses less digits than its factorization.

7218765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473 (or 8470 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 7218765 is about 2686.7759489768. The cubic root of 7218765 is about 193.2654851763.

The spelling of 7218765 in words is "seven million, two hundred eighteen thousand, seven hundred sixty-five".