399935243410225 has 12 divisors (see below), whose sum is σ = 495920123800524. Its totient is φ = 319947922488320.

The previous prime is 399935243410181. The next prime is 399935243410253. The reversal of 399935243410225 is 522014342539993.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8845383826161 + 391089859584064 = 2974119^2 + 19775992^2 .

It is not a de Polignac number, because 399935243410225 - 2¹³ = 399935243402033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26325057 + ... + 38637793.

It is an arithmetic number, because the mean of its divisors is an integer number (41326676983377).

Almost surely, 2^{399935243410225} is an apocalyptic number.

It is an amenable number.

399935243410225 is a deficient number, since it is larger than the sum of its proper divisors (95984880390299).

399935243410225 is a wasteful number, since it uses less digits than its factorization.

399935243410225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13612004 (or 13611999 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 61.

The spelling of 399935243410225 in words is "three hundred ninety-nine trillion, nine hundred thirty-five billion, two hundred forty-three million, four hundred ten thousand, two hundred twenty-five".