7279999 has 2 divisors, whose sum is σ = 7280000. Its totient is φ = 7279998.

The previous prime is 7279997. The next prime is 7280011. The reversal of 7279999 is 9999727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7279999 - 2¹ = 7279997 is a prime.

Together with 7279997, it forms a pair of twin primes.

7279999 is a modest number, since divided by 9999 gives 727 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7279997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3639999 + 3640000.

It is an arithmetic number, because the mean of its divisors is an integer number (3640000).

Almost surely, 2^7279999 is an apocalyptic number.

7279999 is a deficient number, since it is larger than the sum of its proper divisors (1).

7279999 is an equidigital number, since it uses as much as digits as its factorization.

7279999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 642978, while the sum is 52.

The square root of 7279999 is about 2698.1473273341. The cubic root of 7279999 is about 193.8104127946.

The spelling of 7279999 in words is "seven million, two hundred seventy-nine thousand, nine hundred ninety-nine".