42666444 has 18 divisors (see below), whose sum is σ = 107851380. Its totient is φ = 14222136.

The previous prime is 42666443. The next prime is 42666451. The reversal of 42666444 is 44466624.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1185179 = 42666444 / (4 + 2 + 6 + 6 + 6 + 4 + 4 + 4).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 42666399 and 42666408.

It is not an unprimeable number, because it can be changed into a prime (42666443) 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, 592554 + ... + 592625.

Almost surely, 2^42666444 is an apocalyptic number.

It is an amenable number.

42666444 is an abundant number, since it is smaller than the sum of its proper divisors (65184936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42666444 is a wasteful number, since it uses less digits than its factorization.

42666444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185189 (or 1185184 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 42666444 is about 6531.9556030334. The cubic root of 42666444 is about 349.4315780271.

The spelling of 42666444 in words is "forty-two million, six hundred sixty-six thousand, four hundred forty-four".