7218667 has 4 divisors (see below), whose sum is σ = 7271496. Its totient is φ = 7165840.

The previous prime is 7218661. The next prime is 7218677. The reversal of 7218667 is 7668127.

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: 7668127 = 61 ⋅125707.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7218667 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7218661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26209 + ... + 26482.

It is an arithmetic number, because the mean of its divisors is an integer number (1817874).

Almost surely, 2^7218667 is an apocalyptic number.

7218667 is a deficient number, since it is larger than the sum of its proper divisors (52829).

7218667 is a wasteful number, since it uses less digits than its factorization.

7218667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52828.

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

The square root of 7218667 is about 2686.7577114433. The cubic root of 7218667 is about 193.2646105990.

The spelling of 7218667 in words is "seven million, two hundred eighteen thousand, six hundred sixty-seven".