40708209 has 4 divisors (see below), whose sum is σ = 54277616. Its totient is φ = 27138804.

The previous prime is 40708201. The next prime is 40708211. The reversal of 40708209 is 90280704.

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 not a de Polignac number, because 40708209 - 2³ = 40708201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40708201) 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, 6784699 + ... + 6784704.

It is an arithmetic number, because the mean of its divisors is an integer number (13569404).

Almost surely, 2^40708209 is an apocalyptic number.

It is an amenable number.

40708209 is a deficient number, since it is larger than the sum of its proper divisors (13569407).

40708209 is a wasteful number, since it uses less digits than its factorization.

40708209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13569406.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 40708209 is about 6380.2985039887. The cubic root of 40708209 is about 344.0017605147.

The spelling of 40708209 in words is "forty million, seven hundred eight thousand, two hundred nine".