7839649 has 2 divisors, whose sum is σ = 7839650. Its totient is φ = 7839648.

The previous prime is 7839641. The next prime is 7839679. The reversal of 7839649 is 9469387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4545424 + 3294225 = 2132^2 + 1815^2 .

It is a cyclic number.

It is not a de Polignac number, because 7839649 - 2³ = 7839641 is a prime.

It is a super-2 number, since 2×7839649² = 122920192886402, which contains 22 as substring.

It is an Ulam number.

7839649 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7839599 and 7839608.

It is not a weakly prime, because it can be changed into another prime (7839641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3919824 + 3919825.

It is an arithmetic number, because the mean of its divisors is an integer number (3919825).

Almost surely, 2^7839649 is an apocalyptic number.

It is an amenable number.

7839649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7839649 is an equidigital number, since it uses as much as digits as its factorization.

7839649 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 7839649 is about 2799.9373207270. The cubic root of 7839649 is about 198.6547129698.

The spelling of 7839649 in words is "seven million, eight hundred thirty-nine thousand, six hundred forty-nine".