40040861 has 8 divisors (see below), whose sum is σ = 47750784. Its totient is φ = 32828400.

The previous prime is 40040849. The next prime is 40040867. The reversal of 40040861 is 16804004.

It is a happy number.

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-40040861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040867) 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, 124190 + ... + 124511.

It is an arithmetic number, because the mean of its divisors is an integer number (5968848).

Almost surely, 2^40040861 is an apocalyptic number.

It is an amenable number.

40040861 is a deficient number, since it is larger than the sum of its proper divisors (7709923).

40040861 is a wasteful number, since it uses less digits than its factorization.

40040861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248731.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 40040861 is about 6327.7848414749. The cubic root of 40040861 is about 342.1116019168. Note that the first 3 decimals are identical.

Adding to 40040861 its reverse (16804004), we get a palindrome (56844865).

The spelling of 40040861 in words is "forty million, forty thousand, eight hundred sixty-one".