405612257 has 4 divisors (see below), whose sum is σ = 409201860. Its totient is φ = 402022656.

The previous prime is 405612227. The next prime is 405612269. The reversal of 405612257 is 752216504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100620961 + 304991296 = 10031^2 + 17464^2 .

It is a cyclic number.

It is not a de Polignac number, because 405612257 - 2¹⁶ = 405546721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405612227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794632 + ... + 1794857.

It is an arithmetic number, because the mean of its divisors is an integer number (102300465).

Almost surely, 2^405612257 is an apocalyptic number.

It is an amenable number.

405612257 is a deficient number, since it is larger than the sum of its proper divisors (3589603).

405612257 is a wasteful number, since it uses less digits than its factorization.

405612257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589602.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 405612257 is about 20139.8177002673. The cubic root of 405612257 is about 740.2362631275.

The spelling of 405612257 in words is "four hundred five million, six hundred twelve thousand, two hundred fifty-seven".