40105215 has 24 divisors (see below), whose sum is σ = 72540000. Its totient is φ = 20458944.

The previous prime is 40105211. The next prime is 40105229. The reversal of 40105215 is 51250104.

It is not a de Polignac number, because 40105215 - 2² = 40105211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40105211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18340 + ... + 20409.

It is an arithmetic number, because the mean of its divisors is an integer number (3022500).

Almost surely, 2^40105215 is an apocalyptic number.

40105215 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

40105215 is a deficient number, since it is larger than the sum of its proper divisors (32434785).

40105215 is a wasteful number, since it uses less digits than its factorization.

40105215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38783 (or 38780 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 40105215 is about 6332.8678337701. The cubic root of 40105215 is about 342.2947853375.

Adding to 40105215 its reverse (51250104), we get a palindrome (91355319).

The spelling of 40105215 in words is "forty million, one hundred five thousand, two hundred fifteen".