7967621 has 2 divisors, whose sum is σ = 7967622. Its totient is φ = 7967620.

The previous prime is 7967579. The next prime is 7967623. The reversal of 7967621 is 1267697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5452225 + 2515396 = 2335^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 7967621 - 2²² = 3773317 is a prime.

Together with 7967623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7967623) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3983810 + 3983811.

It is an arithmetic number, because the mean of its divisors is an integer number (3983811).

Almost surely, 2^7967621 is an apocalyptic number.

It is an amenable number.

7967621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7967621 is an equidigital number, since it uses as much as digits as its factorization.

7967621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The square root of 7967621 is about 2822.6974687345. The cubic root of 7967621 is about 199.7298101516.

It can be divided in two parts, 79676 and 21, that added together give a palindrome (79697).

The spelling of 7967621 in words is "seven million, nine hundred sixty-seven thousand, six hundred twenty-one".