405656425 has 18 divisors (see below), whose sum is σ = 509445258. Its totient is φ = 320394240.

The previous prime is 405656413. The next prime is 405656467. The reversal of 405656425 is 524656504.

It can be written as a sum of positive squares in 9 ways, for example, as 2128681 + 403527744 = 1459^2 + 20088^2 .

It is not a de Polignac number, because 405656425 - 2¹¹ = 405654377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 991621 + ... + 992029.

Almost surely, 2^405656425 is an apocalyptic number.

It is an amenable number.

405656425 is a deficient number, since it is larger than the sum of its proper divisors (103788833).

405656425 is an frugal number, since it uses more digits than its factorization.

405656425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 405656425 is about 20140.9142046730. The cubic root of 405656425 is about 740.2631307973.

The spelling of 405656425 in words is "four hundred five million, six hundred fifty-six thousand, four hundred twenty-five".