42947777 has 2 divisors, whose sum is σ = 42947778. Its totient is φ = 42947776.

The previous prime is 42947747. The next prime is 42947813. The reversal of 42947777 is 77774924.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29116816 + 13830961 = 5396^2 + 3719^2 .

It is a cyclic number.

It is not a de Polignac number, because 42947777 - 2¹⁰ = 42946753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42947747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21473888 + 21473889.

It is an arithmetic number, because the mean of its divisors is an integer number (21473889).

Almost surely, 2^42947777 is an apocalyptic number.

It is an amenable number.

42947777 is a deficient number, since it is larger than the sum of its proper divisors (1).

42947777 is an equidigital number, since it uses as much as digits as its factorization.

42947777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691488, while the sum is 47.

The square root of 42947777 is about 6553.4553481351. The cubic root of 42947777 is about 350.1979207102.

The spelling of 42947777 in words is "forty-two million, nine hundred forty-seven thousand, seven hundred seventy-seven".