405920260 has 12 divisors (see below), whose sum is σ = 852432588. Its totient is φ = 162368096.

The previous prime is 405920257. The next prime is 405920287. The reversal of 405920260 is 62029504.

It can be written as a sum of positive squares in 2 ways, for example, as 305760196 + 100160064 = 17486^2 + 10008^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10147987 + ... + 10148026.

It is an arithmetic number, because the mean of its divisors is an integer number (71036049).

Almost surely, 2^405920260 is an apocalyptic number.

It is an amenable number.

405920260 is an abundant number, since it is smaller than the sum of its proper divisors (446512328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405920260 is a wasteful number, since it uses less digits than its factorization.

405920260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20296022 (or 20296020 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 405920260 is about 20147.4628675672. The cubic root of 405920260 is about 740.4235826677.

Adding to 405920260 its reverse (62029504), we get a palindrome (467949764).

The spelling of 405920260 in words is "four hundred five million, nine hundred twenty thousand, two hundred sixty".