40808081 has 4 divisors (see below), whose sum is σ = 40823664. Its totient is φ = 40792500.

The previous prime is 40808069. The next prime is 40808093. The reversal of 40808081 is 18080804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40808069) and next prime (40808093).

It is a cyclic number.

It is not a de Polignac number, because 40808081 - 2¹⁰ = 40807057 is a prime.

It is a super-2 number, since 2×40808081² = 3330598949805122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40838081) 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, 2795 + ... + 9456.

It is an arithmetic number, because the mean of its divisors is an integer number (10205916).

Almost surely, 2^40808081 is an apocalyptic number.

It is an amenable number.

40808081 is a deficient number, since it is larger than the sum of its proper divisors (15583).

40808081 is a wasteful number, since it uses less digits than its factorization.

40808081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15582.

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 40808081 is about 6388.1203025616. The cubic root of 40808081 is about 344.2828511258.

Adding to 40808081 its reverse (18080804), we get a palindrome (58888885).

The spelling of 40808081 in words is "forty million, eight hundred eight thousand, eighty-one".