451990 has 32 divisors (see below), whose sum is σ = 1016064. Its totient is φ = 140640.

The previous prime is 451987. The next prime is 452009. The reversal of 451990 is 99154.

451990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 14.

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 15 ways as a sum of consecutive naturals, for example, 477 + ... + 1063.

It is an arithmetic number, because the mean of its divisors is an integer number (31752).

2⁴⁵¹⁹⁹⁰ is an apocalyptic number.

451990 is an abundant number, since it is smaller than the sum of its proper divisors (564074).

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

451990 is a wasteful number, since it uses less digits than its factorization.

451990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 451990 is about 672.3020154663. The cubic root of 451990 is about 76.7437368230.

Subtracting from 451990 its reverse (99154), we obtain a square (352836 = 594²).

It can be divided in two parts, 451 and 990, that added together give a palindrome (1441).

The spelling of 451990 in words is "four hundred fifty-one thousand, nine hundred ninety".