40666690 has 8 divisors (see below), whose sum is σ = 73200060. Its totient is φ = 16266672.

The previous prime is 40666657. The next prime is 40666697. The reversal of 40666690 is 9666604.

It can be written as a sum of positive squares in 2 ways, for example, as 38353249 + 2313441 = 6193^2 + 1521^2 .

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

It is a super-2 number, since 2×40666690² = 3307559351112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40666697) 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, 2033325 + ... + 2033344.

Almost surely, 2^40666690 is an apocalyptic number.

40666690 is a deficient number, since it is larger than the sum of its proper divisors (32533370).

40666690 is a wasteful number, since it uses less digits than its factorization.

40666690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066676.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 40666690 is about 6377.0439860487. The cubic root of 40666690 is about 343.8847696350.

The spelling of 40666690 in words is "forty million, six hundred sixty-six thousand, six hundred ninety".