450840 has 96 divisors (see below), whose sum is σ = 1547280. Its totient is φ = 104448.

The previous prime is 450839. The next prime is 450841. The reversal of 450840 is 48054.

It is an interprime number because it is at equal distance from previous prime (450839) and next prime (450841).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26512 + ... + 26528.

2⁴⁵⁰⁸⁴⁰ is an apocalyptic number.

450840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 450840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773640).

450840 is an abundant number, since it is smaller than the sum of its proper divisors (1096440).

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

450840 is a wasteful number, since it uses less digits than its factorization.

450840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 450840 is about 671.4462003765. The cubic root of 450840 is about 76.6785950774.

Adding to 450840 its reverse (48054), we get a palindrome (498894).

The spelling of 450840 in words is "four hundred fifty thousand, eight hundred forty".