4000409081 has 8 divisors (see below), whose sum is σ = 4026819264. Its totient is φ = 3974022000.

The previous prime is 4000409059. The next prime is 4000409099. The reversal of 4000409081 is 1809040004.

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 4000409081 - 2³⁰ = 2926667257 is a prime.

It is a super-2 number, since 2×4000409081² = 32006545630694529122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4000409081.

It is not an unprimeable number, because it can be changed into a prime (4000409381) 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, 466331 + ... + 474831.

It is an arithmetic number, because the mean of its divisors is an integer number (503352408).

Almost surely, 2^4000409081 is an apocalyptic number.

It is an amenable number.

4000409081 is a deficient number, since it is larger than the sum of its proper divisors (26410183).

4000409081 is a wasteful number, since it uses less digits than its factorization.

4000409081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11551.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 4000409081 is about 63248.7871899533. The cubic root of 4000409081 is about 1587.4551647577.

Adding to 4000409081 its reverse (1809040004), we get a palindrome (5809449085).

The spelling of 4000409081 in words is "four billion, four hundred nine thousand, eighty-one".