7720949 has 2 divisors, whose sum is σ = 7720950. Its totient is φ = 7720948.

The previous prime is 7720943. The next prime is 7720957. The reversal of 7720949 is 9490277.

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., 6340324 + 1380625 = 2518^2 + 1175^2 .

It is an emirp because it is prime and its reverse (9490277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7720949 - 2¹⁶ = 7655413 is a prime.

It is a super-2 number, since 2×7720949² = 119226106921202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7720943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860474 + 3860475.

It is an arithmetic number, because the mean of its divisors is an integer number (3860475).

Almost surely, 2^7720949 is an apocalyptic number.

It is an amenable number.

7720949 is a deficient number, since it is larger than the sum of its proper divisors (1).

7720949 is an equidigital number, since it uses as much as digits as its factorization.

7720949 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7720949 is about 2778.6595689289. The cubic root of 7720949 is about 197.6470005311.

The spelling of 7720949 in words is "seven million, seven hundred twenty thousand, nine hundred forty-nine".