7939849 has 2 divisors, whose sum is σ = 7939850. Its totient is φ = 7939848.

The previous prime is 7939847. The next prime is 7939861. The reversal of 7939849 is 9489397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 71824 = 2805^2 + 268^2 .

It is a cyclic number.

It is not a de Polignac number, because 7939849 - 2¹ = 7939847 is a prime.

Together with 7939847, it forms a pair of twin primes.

7939849 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7939847) 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, 3969924 + 3969925.

It is an arithmetic number, because the mean of its divisors is an integer number (3969925).

Almost surely, 2^7939849 is an apocalyptic number.

It is an amenable number.

7939849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7939849 is an equidigital number, since it uses as much as digits as its factorization.

7939849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 7939849 is about 2817.7737666463. The cubic root of 7939849 is about 199.4974800929.

The spelling of 7939849 in words is "seven million, nine hundred thirty-nine thousand, eight hundred forty-nine".