42666439 has 4 divisors (see below), whose sum is σ = 43819624. Its totient is φ = 41513256.

The previous prime is 42666433. The next prime is 42666443. The reversal of 42666439 is 93466624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42666439 - 2⁹ = 42665927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42666433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576537 + ... + 576610.

It is an arithmetic number, because the mean of its divisors is an integer number (10954906).

Almost surely, 2^42666439 is an apocalyptic number.

42666439 is a deficient number, since it is larger than the sum of its proper divisors (1153185).

42666439 is a wasteful number, since it uses less digits than its factorization.

42666439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153184.

The product of its digits is 186624, while the sum is 40.

The square root of 42666439 is about 6531.9552202997. The cubic root of 42666439 is about 349.4315643773.

The spelling of 42666439 in words is "forty-two million, six hundred sixty-six thousand, four hundred thirty-nine".