404521025 has 6 divisors (see below), whose sum is σ = 501606102. Its totient is φ = 323616800.

The previous prime is 404521003. The next prime is 404521027. The reversal of 404521025 is 520125404.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1635841 + 402885184 = 1279^2 + 20072^2 .

It is not a de Polignac number, because 404521025 - 2¹² = 404516929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (404521027) 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, 8090396 + ... + 8090445.

It is an arithmetic number, because the mean of its divisors is an integer number (83601017).

Almost surely, 2^404521025 is an apocalyptic number.

It is an amenable number.

404521025 is a deficient number, since it is larger than the sum of its proper divisors (97085077).

404521025 is a wasteful number, since it uses less digits than its factorization.

404521025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16180851 (or 16180846 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 404521025 is about 20112.7080474013. The cubic root of 404521025 is about 739.5718396063.

Adding to 404521025 its reverse (520125404), we get a palindrome (924646429).

The spelling of 404521025 in words is "four hundred four million, five hundred twenty-one thousand, twenty-five".