40181999 has 16 divisors (see below), whose sum is σ = 49986720. Its totient is φ = 31733760.

The previous prime is 40181993. The next prime is 40182053. The reversal of 40181999 is 99918104.

40181999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40181999 is a prime.

It is a super-2 number, since 2×40181999² = 3229186087272002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40181993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5834 + ... + 10695.

It is an arithmetic number, because the mean of its divisors is an integer number (3124170).

Almost surely, 2^40181999 is an apocalyptic number.

40181999 is a deficient number, since it is larger than the sum of its proper divisors (9804721).

40181999 is a wasteful number, since it uses less digits than its factorization.

40181999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16570.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 40181999 is about 6338.9272751783. The cubic root of 40181999 is about 342.5130944964.

The spelling of 40181999 in words is "forty million, one hundred eighty-one thousand, nine hundred ninety-nine".