40238209 has 4 divisors (see below), whose sum is σ = 43896240. Its totient is φ = 36580180.

The previous prime is 40238189. The next prime is 40238221. The reversal of 40238209 is 90283204.

40238209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40238209 - 2¹⁵ = 40205441 is a prime.

It is a super-2 number, since 2×40238209² = 3238226927055362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40238309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828999 + ... + 1829020.

It is an arithmetic number, because the mean of its divisors is an integer number (10974060).

Almost surely, 2^40238209 is an apocalyptic number.

It is an amenable number.

40238209 is a deficient number, since it is larger than the sum of its proper divisors (3658031).

40238209 is a wasteful number, since it uses less digits than its factorization.

40238209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658030.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 40238209 is about 6343.3594411794. The cubic root of 40238209 is about 342.6727322370.

The spelling of 40238209 in words is "forty million, two hundred thirty-eight thousand, two hundred nine".