400165225 has 6 divisors (see below), whose sum is σ = 496204910. Its totient is φ = 320132160.

The previous prime is 400165223. The next prime is 400165231. The reversal of 400165225 is 522561004.

It can be written as a sum of positive squares in 3 ways, for example, as 2521744 + 397643481 = 1588^2 + 19941^2 .

It is not a de Polignac number, because 400165225 - 2¹ = 400165223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 16006609 = 400165225 / (4 + 0 + 0 + 1 + 6 + 5 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 400165225.

It is not an unprimeable number, because it can be changed into a prime (400165223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8003280 + ... + 8003329.

Almost surely, 2^400165225 is an apocalyptic number.

It is an amenable number.

400165225 is a deficient number, since it is larger than the sum of its proper divisors (96039685).

400165225 is a wasteful number, since it uses less digits than its factorization.

400165225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16006619 (or 16006614 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 400165225 is about 20004.1301985365. The cubic root of 400165225 is about 736.9077347804.

The spelling of 400165225 in words is "four hundred million, one hundred sixty-five thousand, two hundred twenty-five".