42185977 has 2 divisors, whose sum is σ = 42185978. Its totient is φ = 42185976.

The previous prime is 42185963. The next prime is 42186013. The reversal of 42185977 is 77958124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35652841 + 6533136 = 5971^2 + 2556^2 .

It is a cyclic number.

It is not a de Polignac number, because 42185977 - 2²³ = 33797369 is a prime.

It is not a weakly prime, because it can be changed into another prime (42185917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21092988 + 21092989.

It is an arithmetic number, because the mean of its divisors is an integer number (21092989).

Almost surely, 2^42185977 is an apocalyptic number.

It is an amenable number.

42185977 is a deficient number, since it is larger than the sum of its proper divisors (1).

42185977 is an equidigital number, since it uses as much as digits as its factorization.

42185977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 42185977 is about 6495.0732867305. The cubic root of 42185977 is about 348.1149733507.

The spelling of 42185977 in words is "forty-two million, one hundred eighty-five thousand, nine hundred seventy-seven".