400600909 has 2 divisors, whose sum is σ = 400600910. Its totient is φ = 400600908.

The previous prime is 400600897. The next prime is 400600927. The reversal of 400600909 is 909006004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275228100 + 125372809 = 16590^2 + 11197^2 .

It is a cyclic number.

It is not a de Polignac number, because 400600909 - 2¹⁵ = 400568141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400600609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200300454 + 200300455.

It is an arithmetic number, because the mean of its divisors is an integer number (200300455).

Almost surely, 2^400600909 is an apocalyptic number.

It is an amenable number.

400600909 is a deficient number, since it is larger than the sum of its proper divisors (1).

400600909 is an equidigital number, since it uses as much as digits as its factorization.

400600909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 400600909 is about 20015.0170871773. The cubic root of 400600909 is about 737.1750764026.

The spelling of 400600909 in words is "four hundred million, six hundred thousand, nine hundred nine".