42666040 has 16 divisors (see below), whose sum is σ = 95998680. Its totient is φ = 17066400.

The previous prime is 42665957. The next prime is 42666053. The reversal of 42666040 is 4066624.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533286 + ... + 533365.

Almost surely, 2^42666040 is an apocalyptic number.

42666040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42666040 is an abundant number, since it is smaller than the sum of its proper divisors (53332640).

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

42666040 is a wasteful number, since it uses less digits than its factorization.

42666040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066662 (or 1066658 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 42666040 is about 6531.9246780715. The cubic root of 42666040 is about 349.4304751244.

It can be divided in two parts, 426 and 66040, that added together give a palindrome (66466).

The spelling of 42666040 in words is "forty-two million, six hundred sixty-six thousand, forty".