400809229 has 2 divisors, whose sum is σ = 400809230. Its totient is φ = 400809228.

The previous prime is 400809217. The next prime is 400809239. The reversal of 400809229 is 922908004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349615204 + 51194025 = 18698^2 + 7155^2 .

It is a cyclic number.

It is not a de Polignac number, because 400809229 - 2⁹ = 400808717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400809194 and 400809203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400809239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200404614 + 200404615.

It is an arithmetic number, because the mean of its divisors is an integer number (200404615).

Almost surely, 2^400809229 is an apocalyptic number.

It is an amenable number.

400809229 is a deficient number, since it is larger than the sum of its proper divisors (1).

400809229 is an equidigital number, since it uses as much as digits as its factorization.

400809229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 400809229 is about 20020.2205032812. The cubic root of 400809229 is about 737.3028358898.

The spelling of 400809229 in words is "four hundred million, eight hundred nine thousand, two hundred twenty-nine".