42666417 has 6 divisors (see below), whose sum is σ = 61629282. Its totient is φ = 28444272.

The previous prime is 42666397. The next prime is 42666433. The reversal of 42666417 is 71466624.

It can be written as a sum of positive squares in only one way, i.e., 34999056 + 7667361 = 5916^2 + 2769^2 .

It is not a de Polignac number, because 42666417 - 2⁶ = 42666353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42666497) 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 in 5 ways as a sum of consecutive naturals, for example, 2370348 + ... + 2370365.

It is an arithmetic number, because the mean of its divisors is an integer number (10271547).

Almost surely, 2^42666417 is an apocalyptic number.

It is an amenable number.

42666417 is a deficient number, since it is larger than the sum of its proper divisors (18962865).

42666417 is a wasteful number, since it uses less digits than its factorization.

42666417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4740719 (or 4740716 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 42666417 is about 6531.9535362708. The cubic root of 42666417 is about 349.4315043184.

The spelling of 42666417 in words is "forty-two million, six hundred sixty-six thousand, four hundred seventeen".