40215 has 16 divisors (see below), whose sum is σ = 73728. Its totient is φ = 18336.

The previous prime is 40213. The next prime is 40231. The reversal of 40215 is 51204.

40215 = T₉₀ + T₉₁ + ... + T₉₈.

It is not a de Polignac number, because 40215 - 2¹ = 40213 is a prime.

40215 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 40215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87 + ... + 296.

It is an arithmetic number, because the mean of its divisors is an integer number (4608).

2⁴⁰²¹⁵ is an apocalyptic number.

40215 is a deficient number, since it is larger than the sum of its proper divisors (33513).

40215 is a wasteful number, since it uses less digits than its factorization.

40215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40215 is about 200.5367796690. The cubic root of 40215 is about 34.2606836154.

Adding to 40215 its reverse (51204), we get a palindrome (91419).

The spelling of 40215 in words is "forty thousand, two hundred fifteen".