40312215 has 32 divisors (see below), whose sum is σ = 74787840. Its totient is φ = 20563488.

The previous prime is 40312211. The next prime is 40312241. The reversal of 40312215 is 51221304.

It is not a de Polignac number, because 40312215 - 2² = 40312211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40312211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3387 + ... + 9596.

It is an arithmetic number, because the mean of its divisors is an integer number (2337120).

Almost surely, 2^40312215 is an apocalyptic number.

40312215 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

40312215 is a deficient number, since it is larger than the sum of its proper divisors (34475625).

40312215 is a wasteful number, since it uses less digits than its factorization.

40312215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020 (or 13014 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 40312215 is about 6349.1901058324. The cubic root of 40312215 is about 342.8826844811.

Adding to 40312215 its reverse (51221304), we get a palindrome (91533519).

The spelling of 40312215 in words is "forty million, three hundred twelve thousand, two hundred fifteen".