40006787 has 4 divisors (see below), whose sum is σ = 40035456. Its totient is φ = 39978120.

The previous prime is 40006783. The next prime is 40006793. The reversal of 40006787 is 78760004.

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 40006787 - 2² = 40006783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40006781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12128 + ... + 15069.

It is an arithmetic number, because the mean of its divisors is an integer number (10008864).

Almost surely, 2^40006787 is an apocalyptic number.

40006787 is a deficient number, since it is larger than the sum of its proper divisors (28669).

40006787 is a wasteful number, since it uses less digits than its factorization.

40006787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28668.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 40006787 is about 6325.0918570405. The cubic root of 40006787 is about 342.0145309194.

The spelling of 40006787 in words is "forty million, six thousand, seven hundred eighty-seven".