400495709 has 2 divisors, whose sum is σ = 400495710. Its totient is φ = 400495708.

The previous prime is 400495633. The next prime is 400495721. The reversal of 400495709 is 907594004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341436484 + 59059225 = 18478^2 + 7685^2 .

It is a cyclic number.

It is not a de Polignac number, because 400495709 - 2¹² = 400491613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400495729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200247854 + 200247855.

It is an arithmetic number, because the mean of its divisors is an integer number (200247855).

Almost surely, 2^400495709 is an apocalyptic number.

It is an amenable number.

400495709 is a deficient number, since it is larger than the sum of its proper divisors (1).

400495709 is an equidigital number, since it uses as much as digits as its factorization.

400495709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 400495709 is about 20012.3888878864. The cubic root of 400495709 is about 737.1105420113.

The spelling of 400495709 in words is "four hundred million, four hundred ninety-five thousand, seven hundred nine".