40315209 has 16 divisors (see below), whose sum is σ = 60006144. Its totient is φ = 23864400.

The previous prime is 40315189. The next prime is 40315229. The reversal of 40315209 is 90251304.

It is an interprime number because it is at equal distance from previous prime (40315189) and next prime (40315229).

It is not a de Polignac number, because 40315209 - 2⁷ = 40315081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40315229) 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, 12787 + ... + 15624.

It is an arithmetic number, because the mean of its divisors is an integer number (3750384).

Almost surely, 2^40315209 is an apocalyptic number.

It is an amenable number.

40315209 is a deficient number, since it is larger than the sum of its proper divisors (19690935).

40315209 is a wasteful number, since it uses less digits than its factorization.

40315209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28468.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 40315209 is about 6349.4258795579. The cubic root of 40315209 is about 342.8911729367.

The spelling of 40315209 in words is "forty million, three hundred fifteen thousand, two hundred nine".