40007861 has 8 divisors (see below), whose sum is σ = 40832064. Its totient is φ = 39191040.

The previous prime is 40007843. The next prime is 40007881. The reversal of 40007861 is 16870004.

40007861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40007861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40007861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40007801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9845 + ... + 13301.

It is an arithmetic number, because the mean of its divisors is an integer number (5104008).

Almost surely, 2^40007861 is an apocalyptic number.

It is an amenable number.

40007861 is a deficient number, since it is larger than the sum of its proper divisors (824203).

40007861 is a wasteful number, since it uses less digits than its factorization.

40007861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 40007861 is about 6325.1767564235. The cubic root of 40007861 is about 342.0175914027.

Adding to 40007861 its reverse (16870004), we get a palindrome (56877865).

The spelling of 40007861 in words is "forty million, seven thousand, eight hundred sixty-one".