40165987 has 8 divisors (see below), whose sum is σ = 42032000. Its totient is φ = 38335680.

The previous prime is 40165973. The next prime is 40165991. The reversal of 40165987 is 78956104.

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

It is a cyclic number.

It is not a de Polignac number, because 40165987 - 2¹¹ = 40163939 is a prime.

It is a super-2 number, since 2×40165987² = 3226613023368338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40165927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6612 + ... + 11137.

It is an arithmetic number, because the mean of its divisors is an integer number (5254000).

Almost surely, 2^40165987 is an apocalyptic number.

40165987 is a deficient number, since it is larger than the sum of its proper divisors (1866013).

40165987 is a wasteful number, since it uses less digits than its factorization.

40165987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17853.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 40165987 is about 6337.6641596096. The cubic root of 40165987 is about 342.4675927922.

The spelling of 40165987 in words is "forty million, one hundred sixty-five thousand, nine hundred eighty-seven".