400461209 has 2 divisors, whose sum is σ = 400461210. Its totient is φ = 400461208.

The previous prime is 400461199. The next prime is 400461223. The reversal of 400461209 is 902164004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236544400 + 163916809 = 15380^2 + 12803^2 .

It is a cyclic number.

It is not a de Polignac number, because 400461209 - 2²⁸ = 132025753 is a prime.

It is not a weakly prime, because it can be changed into another prime (400461289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200230604 + 200230605.

It is an arithmetic number, because the mean of its divisors is an integer number (200230605).

Almost surely, 2^400461209 is an apocalyptic number.

It is an amenable number.

400461209 is a deficient number, since it is larger than the sum of its proper divisors (1).

400461209 is an equidigital number, since it uses as much as digits as its factorization.

400461209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 400461209 is about 20011.5269032625. The cubic root of 400461209 is about 737.0893757055.

The spelling of 400461209 in words is "four hundred million, four hundred sixty-one thousand, two hundred nine".