7278949 has 2 divisors, whose sum is σ = 7278950. Its totient is φ = 7278948.

The previous prime is 7278917. The next prime is 7278959. The reversal of 7278949 is 9498727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7236100 + 42849 = 2690^2 + 207^2 .

It is a cyclic number.

It is not a de Polignac number, because 7278949 - 2⁵ = 7278917 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 7278899 and 7278908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7278959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3639474 + 3639475.

It is an arithmetic number, because the mean of its divisors is an integer number (3639475).

Almost surely, 2^7278949 is an apocalyptic number.

It is an amenable number.

7278949 is a deficient number, since it is larger than the sum of its proper divisors (1).

7278949 is an equidigital number, since it uses as much as digits as its factorization.

7278949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The square root of 7278949 is about 2697.9527423585. The cubic root of 7278949 is about 193.8010945370.

The spelling of 7278949 in words is "seven million, two hundred seventy-eight thousand, nine hundred forty-nine".