42799649 has 2 divisors, whose sum is σ = 42799650. Its totient is φ = 42799648.

The previous prime is 42799643. The next prime is 42799651. The reversal of 42799649 is 94699724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38254225 + 4545424 = 6185^2 + 2132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42799649 is a prime.

Together with 42799651, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42799597 and 42799606.

It is not a weakly prime, because it can be changed into another prime (42799643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21399824 + 21399825.

It is an arithmetic number, because the mean of its divisors is an integer number (21399825).

Almost surely, 2^42799649 is an apocalyptic number.

It is an amenable number.

42799649 is a deficient number, since it is larger than the sum of its proper divisors (1).

42799649 is an equidigital number, since it uses as much as digits as its factorization.

42799649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 42799649 is about 6542.1440675057. The cubic root of 42799649 is about 349.7948430334.

The spelling of 42799649 in words is "forty-two million, seven hundred ninety-nine thousand, six hundred forty-nine".