42647977 has 2 divisors, whose sum is σ = 42647978. Its totient is φ = 42647976.

The previous prime is 42647947. The next prime is 42647981. The reversal of 42647977 is 77974624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41718681 + 929296 = 6459^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 42647977 - 2¹¹ = 42645929 is a prime.

It is not a weakly prime, because it can be changed into another prime (42647947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21323988 + 21323989.

It is an arithmetic number, because the mean of its divisors is an integer number (21323989).

Almost surely, 2^42647977 is an apocalyptic number.

It is an amenable number.

42647977 is a deficient number, since it is larger than the sum of its proper divisors (1).

42647977 is an equidigital number, since it uses as much as digits as its factorization.

42647977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 46.

The square root of 42647977 is about 6530.5418611322. The cubic root of 42647977 is about 349.3811567938.

The spelling of 42647977 in words is "forty-two million, six hundred forty-seven thousand, nine hundred seventy-seven".