40166387 has 4 divisors (see below), whose sum is σ = 40564176. Its totient is φ = 39768600.

The previous prime is 40166383. The next prime is 40166389. The reversal of 40166387 is 78366104.

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 40166387 - 2² = 40166383 is a prime.

It is a super-2 number, since 2×40166387² = 3226677289267538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40166381) 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, 198743 + ... + 198944.

It is an arithmetic number, because the mean of its divisors is an integer number (10141044).

Almost surely, 2^40166387 is an apocalyptic number.

40166387 is a deficient number, since it is larger than the sum of its proper divisors (397789).

40166387 is a wasteful number, since it uses less digits than its factorization.

40166387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397788.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40166387 is about 6337.6957168990. The cubic root of 40166387 is about 342.4687296295.

The spelling of 40166387 in words is "forty million, one hundred sixty-six thousand, three hundred eighty-seven".