7938649 has 2 divisors, whose sum is σ = 7938650. Its totient is φ = 7938648.

The previous prime is 7938641. The next prime is 7938727. The reversal of 7938649 is 9468397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5856400 + 2082249 = 2420^2 + 1443^2 .

It is a cyclic number.

It is not a de Polignac number, because 7938649 - 2³ = 7938641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7938599 and 7938608.

It is not a weakly prime, because it can be changed into another prime (7938641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969324 + 3969325.

It is an arithmetic number, because the mean of its divisors is an integer number (3969325).

Almost surely, 2^7938649 is an apocalyptic number.

It is an amenable number.

7938649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938649 is an equidigital number, since it uses as much as digits as its factorization.

7938649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 7938649 is about 2817.5608245431. The cubic root of 7938649 is about 199.4874291445.

The spelling of 7938649 in words is "seven million, nine hundred thirty-eight thousand, six hundred forty-nine".