7918643 has 2 divisors, whose sum is σ = 7918644. Its totient is φ = 7918642.

The previous prime is 7918637. The next prime is 7918657. The reversal of 7918643 is 3468197.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7918643 - 2⁴ = 7918627 is a prime.

It is a super-2 number, since 2×7918643² = 125409813922898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7918597 and 7918606.

It is not a weakly prime, because it can be changed into another prime (7918613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3959321 + 3959322.

It is an arithmetic number, because the mean of its divisors is an integer number (3959322).

Almost surely, 2^7918643 is an apocalyptic number.

7918643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7918643 is an equidigital number, since it uses as much as digits as its factorization.

7918643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 7918643 is about 2814.0083510892. The cubic root of 7918643 is about 199.3197136762.

The spelling of 7918643 in words is "seven million, nine hundred eighteen thousand, six hundred forty-three".