451630 has 16 divisors (see below), whose sum is σ = 856080. Its totient is φ = 171072.

The previous prime is 451621. The next prime is 451637. The reversal of 451630 is 36154.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 451598 and 451607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451637) by changing a digit.

451630 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 999 + ... + 1378.

It is an arithmetic number, because the mean of its divisors is an integer number (53505).

2⁴⁵¹⁶³⁰ is an apocalyptic number.

451630 is a deficient number, since it is larger than the sum of its proper divisors (404450).

451630 is a wasteful number, since it uses less digits than its factorization.

451630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 451630 is about 672.0342253189. The cubic root of 451630 is about 76.7233565170.

Adding to 451630 its reverse (36154), we get a palindrome (487784).

It can be divided in two parts, 451 and 630, that added together give a triangular number (1081 = T₄₆).

The spelling of 451630 in words is "four hundred fifty-one thousand, six hundred thirty".