40005831 has 8 divisors (see below), whose sum is σ = 54347760. Its totient is φ = 26167232.

The previous prime is 40005829. The next prime is 40005853. The reversal of 40005831 is 13850004.

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 40005831 - 2¹ = 40005829 is a prime.

It is a super-2 number, since 2×40005831² = 3200933028001122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40005798 and 40005807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40005871) 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, 125646 + ... + 125963.

It is an arithmetic number, because the mean of its divisors is an integer number (6793470).

Almost surely, 2^40005831 is an apocalyptic number.

40005831 is a deficient number, since it is larger than the sum of its proper divisors (14341929).

40005831 is a wasteful number, since it uses less digits than its factorization.

40005831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251665.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 40005831 is about 6325.0162845640. The cubic root of 40005831 is about 342.0118066441.

Adding to 40005831 its reverse (13850004), we get a palindrome (53855835).

The spelling of 40005831 in words is "forty million, five thousand, eight hundred thirty-one".