40042666 has 8 divisors (see below), whose sum is σ = 61197444. Its totient is φ = 19643520.

The previous prime is 40042661. The next prime is 40042679. The reversal of 40042666 is 66624004.

It can be written as a sum of positive squares in 2 ways, for example, as 37466641 + 2576025 = 6121^2 + 1605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (40042661) 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, 188775 + ... + 188986.

Almost surely, 2^40042666 is an apocalyptic number.

40042666 is a deficient number, since it is larger than the sum of its proper divisors (21154778).

40042666 is a wasteful number, since it uses less digits than its factorization.

40042666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377816.

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

The square root of 40042666 is about 6327.9274648182. The cubic root of 40042666 is about 342.1167425169.

It can be divided in two parts, 4004 and 2666, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 40042666 in words is "forty million, forty-two thousand, six hundred sixty-six".