400246225 has 12 divisors (see below), whose sum is σ = 503106316. Its totient is φ = 315809280.

The previous prime is 400246211. The next prime is 400246243. The reversal of 400246225 is 522642004.

It can be written as a sum of positive squares in 6 ways, for example, as 24196561 + 376049664 = 4919^2 + 19392^2 .

It is a de Polignac number, because none of the positive numbers 2^k-400246225 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400246225.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 107832 + ... + 111481.

Almost surely, 2^400246225 is an apocalyptic number.

It is an amenable number.

400246225 is a deficient number, since it is larger than the sum of its proper divisors (102860091).

400246225 is a wasteful number, since it uses less digits than its factorization.

400246225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219396 (or 219391 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 400246225 is about 20006.1546779985. The cubic root of 400246225 is about 736.9574521604.

Adding to 400246225 its reverse (522642004), we get a palindrome (922888229).

The spelling of 400246225 in words is "four hundred million, two hundred forty-six thousand, two hundred twenty-five".