404405125 has 16 divisors (see below), whose sum is σ = 509915952. Its totient is φ = 320179200.

The previous prime is 404405123. The next prime is 404405147. The reversal of 404405125 is 521504404.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 233998209 + 170406916 = 15297^2 + 13054^2 .

It is not a de Polignac number, because 404405125 - 2¹ = 404405123 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 404405125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404405123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4552 + ... + 28801.

It is an arithmetic number, because the mean of its divisors is an integer number (31869747).

Almost surely, 2^404405125 is an apocalyptic number.

It is an amenable number.

404405125 is a deficient number, since it is larger than the sum of its proper divisors (105510827).

404405125 is an equidigital number, since it uses as much as digits as its factorization.

404405125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33465 (or 33455 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 404405125 is about 20109.8265780687. The cubic root of 404405125 is about 739.5012008685.

Adding to 404405125 its reverse (521504404), we get a palindrome (925909529).

The spelling of 404405125 in words is "four hundred four million, four hundred five thousand, one hundred twenty-five".