40000861 has 4 divisors (see below), whose sum is σ = 40548892. Its totient is φ = 39452832.

The previous prime is 40000853. The next prime is 40000867. The reversal of 40000861 is 16800004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25704900 + 14295961 = 5070^2 + 3781^2 .

It is a cyclic number.

It is not a de Polignac number, because 40000861 - 2³ = 40000853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000867) 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, 273906 + ... + 274051.

It is an arithmetic number, because the mean of its divisors is an integer number (10137223).

Almost surely, 2^40000861 is an apocalyptic number.

It is an amenable number.

40000861 is a deficient number, since it is larger than the sum of its proper divisors (548031).

40000861 is an equidigital number, since it uses as much as digits as its factorization.

40000861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548030.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 40000861 is about 6324.6233879971. The cubic root of 40000861 is about 341.9976431332.

Adding to 40000861 its reverse (16800004), we get a palindrome (56800865).

The spelling of 40000861 in words is "forty million, eight hundred sixty-one", and thus it is an aban number.