40020242209 has 4 divisors (see below), whose sum is σ = 40021344916. Its totient is φ = 40019139504.

The previous prime is 40020242191. The next prime is 40020242221. The reversal of 40020242209 is 90224202004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38563140625 + 1457101584 = 196375^2 + 38172^2 .

It is a cyclic number.

It is not a de Polignac number, because 40020242209 - 2¹³ = 40020234017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40020242609) 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, 494994 + ... + 570139.

It is an arithmetic number, because the mean of its divisors is an integer number (10005336229).

Almost surely, 2^40020242209 is an apocalyptic number.

It is an amenable number.

40020242209 is a deficient number, since it is larger than the sum of its proper divisors (1102707).

40020242209 is a wasteful number, since it uses less digits than its factorization.

40020242209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102706.

The product of its (nonzero) digits is 2304, while the sum is 25.

The spelling of 40020242209 in words is "forty billion, twenty million, two hundred forty-two thousand, two hundred nine".