400440204217 has 2 divisors, whose sum is σ = 400440204218. Its totient is φ = 400440204216.

The previous prime is 400440204179. The next prime is 400440204221. The reversal of 400440204217 is 712402044004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338961497616 + 61478706601 = 582204^2 + 247949^2 .

It is a cyclic number.

It is not a de Polignac number, because 400440204217 - 2¹⁹ = 400439679929 is a prime.

It is not a weakly prime, because it can be changed into another prime (400440204287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200220102108 + 200220102109.

It is an arithmetic number, because the mean of its divisors is an integer number (200220102109).

Almost surely, 2^400440204217 is an apocalyptic number.

It is an amenable number.

400440204217 is a deficient number, since it is larger than the sum of its proper divisors (1).

400440204217 is an equidigital number, since it uses as much as digits as its factorization.

400440204217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 28.

The spelling of 400440204217 in words is "four hundred billion, four hundred forty million, two hundred four thousand, two hundred seventeen".