40145 has 16 divisors (see below), whose sum is σ = 58368. Its totient is φ = 25920.

The previous prime is 40129. The next prime is 40151. The reversal of 40145 is 54104.

Added to its reverse (54104) it gives a square (94249 = 307²).

40145 is nontrivially palindromic in base 6.

40145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40145 - 2⁴ = 40129 is a prime.

It is a super-2 number, since 2×40145² = 3223242050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1067 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (3648).

2⁴⁰¹⁴⁵ is an apocalyptic number.

It is an amenable number.

40145 is a deficient number, since it is larger than the sum of its proper divisors (18223).

40145 is a wasteful number, since it uses less digits than its factorization.

40145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 40145 is about 200.3621720785. The cubic root of 40145 is about 34.2407935189.

Adding to 40145 its reverse (54104), we get a palindrome (94249).

The spelling of 40145 in words is "forty thousand, one hundred forty-five".