405400025 has 12 divisors (see below), whose sum is σ = 509584572. Its totient is φ = 319875840.

The previous prime is 405399959. The next prime is 405400027. The reversal of 405400025 is 520004504.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4439449 + 400960576 = 2107^2 + 20024^2 .

It is not a de Polignac number, because 405400025 - 2²⁴ = 388622809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405400027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109244 + ... + 112893.

It is an arithmetic number, because the mean of its divisors is an integer number (42465381).

Almost surely, 2^405400025 is an apocalyptic number.

It is an amenable number.

405400025 is a deficient number, since it is larger than the sum of its proper divisors (104184547).

405400025 is a wasteful number, since it uses less digits than its factorization.

405400025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222220 (or 222215 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 405400025 is about 20134.5480455857. The cubic root of 405400025 is about 740.1071338680.

Adding to 405400025 its reverse (520004504), we get a palindrome (925404529).

The spelling of 405400025 in words is "four hundred five million, four hundred thousand, twenty-five".