42982909 has 2 divisors, whose sum is σ = 42982910. Its totient is φ = 42982908.

The previous prime is 42982897. The next prime is 42982913. The reversal of 42982909 is 90928924.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42968025 + 14884 = 6555^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 42982909 - 2⁹ = 42982397 is a prime.

It is a super-2 number, since 2×42982909² = 3695060932204562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42982949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21491454 + 21491455.

It is an arithmetic number, because the mean of its divisors is an integer number (21491455).

Almost surely, 2^42982909 is an apocalyptic number.

It is an amenable number.

42982909 is a deficient number, since it is larger than the sum of its proper divisors (1).

42982909 is an equidigital number, since it uses as much as digits as its factorization.

42982909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 42982909 is about 6556.1352182517. The cubic root of 42982909 is about 350.2933839372.

It can be divided in two parts, 429 and 82909, that added together give a palindrome (83338).

The spelling of 42982909 in words is "forty-two million, nine hundred eighty-two thousand, nine hundred nine".