451540 has 24 divisors (see below), whose sum is σ = 961632. Its totient is φ = 178080.

The previous prime is 451523. The next prime is 451541. The reversal of 451540 is 45154.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451541) 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 7 ways as a sum of consecutive naturals, for example, 2035 + ... + 2245.

It is an arithmetic number, because the mean of its divisors is an integer number (40068).

2⁴⁵¹⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

451540 is an abundant number, since it is smaller than the sum of its proper divisors (510092).

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

451540 is a wasteful number, since it uses less digits than its factorization.

451540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 325 counting only the distinct ones).

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

The square root of 451540 is about 671.9672611073. The cubic root of 451540 is about 76.7182597484.

Adding to 451540 its reverse (45154), we get a palindrome (496694).

The spelling of 451540 in words is "four hundred fifty-one thousand, five hundred forty".