40115 has 8 divisors (see below), whose sum is σ = 49248. Its totient is φ = 31360.

The previous prime is 40111. The next prime is 40123. The reversal of 40115 is 51104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40115 - 2² = 40111 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40096 and 40105.

It is not an unprimeable number, because it can be changed into a prime (40111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299 + ... + 411.

It is an arithmetic number, because the mean of its divisors is an integer number (6156).

2⁴⁰¹¹⁵ is an apocalyptic number.

40115 is a deficient number, since it is larger than the sum of its proper divisors (9133).

40115 is a wasteful number, since it uses less digits than its factorization.

40115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 40115 is about 200.2872936559. The cubic root of 40115 is about 34.2322621136.

Subtracting from 40115 its sum of digits (11), we obtain a palindrome (40104).

Adding to 40115 its reverse (51104), we get a palindrome (91219).

The spelling of 40115 in words is "forty thousand, one hundred fifteen".