40099 has 2 divisors, whose sum is σ = 40100. Its totient is φ = 40098.

The previous prime is 40093. The next prime is 40111. The reversal of 40099 is 99004.

40099 = T₁₆₂ + T₁₆₃ + T₁₆₄.

40099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40099 - 2⁷ = 39971 is a prime.

It is a Chen prime.

40099 is a modest number, since divided by 99 gives 4 as remainder.

It is not a weakly prime, because it can be changed into another prime (40093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20049 + 20050.

It is an arithmetic number, because the mean of its divisors is an integer number (20050).

2⁴⁰⁰⁹⁹ is an apocalyptic number.

40099 is the 164-th centered triangular number.

40099 is a deficient number, since it is larger than the sum of its proper divisors (1).

40099 is an equidigital number, since it uses as much as digits as its factorization.

40099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 40099 is about 200.2473470486. The cubic root of 40099 is about 34.2277102916.

The spelling of 40099 in words is "forty thousand, ninety-nine".