40208971 has 4 divisors (see below), whose sum is σ = 43864344. Its totient is φ = 36553600.

The previous prime is 40208963. The next prime is 40208977. The reversal of 40208971 is 17980204.

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

It is a cyclic number.

It is not a de Polignac number, because 40208971 - 2³ = 40208963 is a prime.

It is a super-2 number, since 2×40208971² = 3233522697757682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40208977) 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, 1827670 + ... + 1827691.

It is an arithmetic number, because the mean of its divisors is an integer number (10966086).

Almost surely, 2^40208971 is an apocalyptic number.

40208971 is a deficient number, since it is larger than the sum of its proper divisors (3655373).

40208971 is a wasteful number, since it uses less digits than its factorization.

40208971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655372.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 40208971 is about 6341.0544075887. The cubic root of 40208971 is about 342.5897141863.

The spelling of 40208971 in words is "forty million, two hundred eight thousand, nine hundred seventy-one".