405457 has 4 divisors (see below), whose sum is σ = 436660. Its totient is φ = 374256.

The previous prime is 405439. The next prime is 405473. The reversal of 405457 is 754504.

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 46656 + 358801 = 216^2 + 599^2 .

It is a cyclic number.

It is not a de Polignac number, because 405457 - 2¹⁵ = 372689 is a prime.

It is a Duffinian number.

405457 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (405407) by changing a digit.

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, 15582 + ... + 15607.

It is an arithmetic number, because the mean of its divisors is an integer number (109165).

2⁴⁰⁵⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

405457 is a deficient number, since it is larger than the sum of its proper divisors (31203).

405457 is a wasteful number, since it uses less digits than its factorization.

405457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31202.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 405457 is about 636.7550549466. The cubic root of 405457 is about 74.0141803845.

The spelling of 405457 in words is "four hundred five thousand, four hundred fifty-seven".