7840949 has 2 divisors, whose sum is σ = 7840950. Its totient is φ = 7840948.

The previous prime is 7840913. The next prime is 7840967. The reversal of 7840949 is 9490487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6340324 + 1500625 = 2518^2 + 1225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7840949 is a prime.

It is a super-2 number, since 2×7840949² = 122960962441202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7840909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3920474 + 3920475.

It is an arithmetic number, because the mean of its divisors is an integer number (3920475).

Almost surely, 2^7840949 is an apocalyptic number.

It is an amenable number.

7840949 is a deficient number, since it is larger than the sum of its proper divisors (1).

7840949 is an equidigital number, since it uses as much as digits as its factorization.

7840949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 7840949 is about 2800.1694591578. The cubic root of 7840949 is about 198.6656929195.

The spelling of 7840949 in words is "seven million, eight hundred forty thousand, nine hundred forty-nine".