40019 has 4 divisors (see below), whose sum is σ = 45744. Its totient is φ = 34296.

The previous prime is 40013. The next prime is 40031. The reversal of 40019 is 91004.

40019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40019 - 2¹² = 35923 is a prime.

It is a super-2 number, since 2×40019² = 3203040722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 39985 and 40012.

It is not an unprimeable number, because it can be changed into a prime (40013) 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, 2852 + ... + 2865.

It is an arithmetic number, because the mean of its divisors is an integer number (11436).

2⁴⁰⁰¹⁹ is an apocalyptic number.

40019 is a deficient number, since it is larger than the sum of its proper divisors (5725).

40019 is an equidigital number, since it uses as much as digits as its factorization.

40019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 40019 is about 200.0474943607. The cubic root of 40019 is about 34.2049330002.

The spelling of 40019 in words is "forty thousand, nineteen".