450721 has 4 divisors (see below), whose sum is σ = 477252. Its totient is φ = 424192.

The previous prime is 450719. The next prime is 450727. The reversal of 450721 is 127054.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127054 = 2 ⋅63527.

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 239121 = 460^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 450721 - 2¹ = 450719 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (450727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13240 + ... + 13273.

It is an arithmetic number, because the mean of its divisors is an integer number (119313).

2⁴⁵⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

450721 is a deficient number, since it is larger than the sum of its proper divisors (26531).

450721 is a wasteful number, since it uses less digits than its factorization.

450721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26530.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 450721 is about 671.3575798336. The cubic root of 450721 is about 76.6718480010.

Adding to 450721 its reverse (127054), we get a palindrome (577775).

The spelling of 450721 in words is "four hundred fifty thousand, seven hundred twenty-one".