7992421 has 2 divisors, whose sum is σ = 7992422. Its totient is φ = 7992420.

The previous prime is 7992419. The next prime is 7992463. The reversal of 7992421 is 1242997.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7756225 + 236196 = 2785^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 7992421 - 2¹ = 7992419 is a prime.

Together with 7992419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7992401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3996210 + 3996211.

It is an arithmetic number, because the mean of its divisors is an integer number (3996211).

Almost surely, 2^7992421 is an apocalyptic number.

It is an amenable number.

7992421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7992421 is an equidigital number, since it uses as much as digits as its factorization.

7992421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 7992421 is about 2827.0870167011. The cubic root of 7992421 is about 199.9368217113.

The spelling of 7992421 in words is "seven million, nine hundred ninety-two thousand, four hundred twenty-one".