40206709 has 2 divisors, whose sum is σ = 40206710. Its totient is φ = 40206708.

The previous prime is 40206707. The next prime is 40206811. The reversal of 40206709 is 90760204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39250225 + 956484 = 6265^2 + 978^2 .

It is a cyclic number.

It is not a de Polignac number, because 40206709 - 2¹ = 40206707 is a prime.

It is a super-2 number, since 2×40206709² = 3233158897221362, which contains 22 as substring.

Together with 40206707, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40206707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20103354 + 20103355.

It is an arithmetic number, because the mean of its divisors is an integer number (20103355).

Almost surely, 2^40206709 is an apocalyptic number.

It is an amenable number.

40206709 is a deficient number, since it is larger than the sum of its proper divisors (1).

40206709 is an equidigital number, since it uses as much as digits as its factorization.

40206709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40206709 is about 6340.8760435763. The cubic root of 40206709 is about 342.5832898118.

The spelling of 40206709 in words is "forty million, two hundred six thousand, seven hundred nine".