451405 has 4 divisors (see below), whose sum is σ = 541692. Its totient is φ = 361120.

The previous prime is 451397. The next prime is 451411. The reversal of 451405 is 504154.

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 203401 + 248004 = 451^2 + 498^2 .

It is not a de Polignac number, because 451405 - 2³ = 451397 is a prime.

It is an Ulam number.

It is a Duffinian number.

451405 is a lucky number.

It is a congruent number.

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, 45136 + ... + 45145.

It is an arithmetic number, because the mean of its divisors is an integer number (135423).

2⁴⁵¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

451405 is a deficient number, since it is larger than the sum of its proper divisors (90287).

451405 is an equidigital number, since it uses as much as digits as its factorization.

451405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90286.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 451405 is about 671.8668022756. The cubic root of 451405 is about 76.7106133255.

Adding to 451405 its reverse (504154), we get a palindrome (955559).

The spelling of 451405 in words is "four hundred fifty-one thousand, four hundred five".