40088209 has 4 divisors (see below), whose sum is σ = 45815104. Its totient is φ = 34361316.

The previous prime is 40088207. The next prime is 40088221. The reversal of 40088209 is 90288004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40088209 - 2¹ = 40088207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40088203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2863437 + ... + 2863450.

It is an arithmetic number, because the mean of its divisors is an integer number (11453776).

Almost surely, 2^40088209 is an apocalyptic number.

It is an amenable number.

40088209 is a deficient number, since it is larger than the sum of its proper divisors (5726895).

40088209 is an equidigital number, since it uses as much as digits as its factorization.

40088209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726894.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 40088209 is about 6331.5250137704. The cubic root of 40088209 is about 342.2463968831.

It can be divided in two parts, 400 and 88209, that multiplied together give a square (35283600 = 5940²).

The spelling of 40088209 in words is "forty million, eighty-eight thousand, two hundred nine".