42347777 has 2 divisors, whose sum is σ = 42347778. Its totient is φ = 42347776.

The previous prime is 42347771. The next prime is 42347779. The reversal of 42347777 is 77774324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37503376 + 4844401 = 6124^2 + 2201^2 .

It is a cyclic number.

It is not a de Polignac number, because 42347777 - 2⁸ = 42347521 is a prime.

Together with 42347779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42347771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21173888 + 21173889.

It is an arithmetic number, because the mean of its divisors is an integer number (21173889).

Almost surely, 2^42347777 is an apocalyptic number.

It is an amenable number.

42347777 is a deficient number, since it is larger than the sum of its proper divisors (1).

42347777 is an equidigital number, since it uses as much as digits as its factorization.

42347777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230496, while the sum is 41.

The square root of 42347777 is about 6507.5169611765. The cubic root of 42347777 is about 348.5594586997.

The spelling of 42347777 in words is "forty-two million, three hundred forty-seven thousand, seven hundred seventy-seven".