40999 has 4 divisors (see below), whose sum is σ = 46864. Its totient is φ = 35136.

The previous prime is 40993. The next prime is 41011. The reversal of 40999 is 99904.

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 40999 - 2⁹ = 40487 is a prime.

It is a Duffinian number.

40999 is a modest number, since divided by 999 gives 40 as remainder.

40999 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 40999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40993) 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, 2922 + ... + 2935.

It is an arithmetic number, because the mean of its divisors is an integer number (11716).

2⁴⁰⁹⁹⁹ is an apocalyptic number.

40999 is a deficient number, since it is larger than the sum of its proper divisors (5865).

40999 is an equidigital number, since it uses as much as digits as its factorization.

40999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5864.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 40999 is about 202.4820979741. The cubic root of 40999 is about 34.4818920587.

Subtracting from 40999 its product of nonzero digits (2916), we obtain a palindrome (38083).

The spelling of 40999 in words is "forty thousand, nine hundred ninety-nine".