40003971 has 8 divisors (see below), whose sum is σ = 60958464. Its totient is φ = 22859400.

The previous prime is 40003961. The next prime is 40003973. The reversal of 40003971 is 17930004.

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

It is not a de Polignac number, because 40003971 - 2⁵ = 40003939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40003973) 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 7 ways as a sum of consecutive naturals, for example, 952455 + ... + 952496.

It is an arithmetic number, because the mean of its divisors is an integer number (7619808).

Almost surely, 2^40003971 is an apocalyptic number.

40003971 is a deficient number, since it is larger than the sum of its proper divisors (20954493).

40003971 is a wasteful number, since it uses less digits than its factorization.

40003971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904961.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 40003971 is about 6324.8692476604. The cubic root of 40003971 is about 342.0065061517.

Adding to 40003971 its reverse (17930004), we get a palindrome (57933975).

The spelling of 40003971 in words is "forty million, three thousand, nine hundred seventy-one".