420451 has 4 divisors (see below), whose sum is σ = 442600. Its totient is φ = 398304.

The previous prime is 420439. The next prime is 420457. The reversal of 420451 is 154024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420451 - 2⁵ = 420419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420457) 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, 11046 + ... + 11083.

It is an arithmetic number, because the mean of its divisors is an integer number (110650).

2⁴²⁰⁴⁵¹ is an apocalyptic number.

420451 is a deficient number, since it is larger than the sum of its proper divisors (22149).

420451 is a wasteful number, since it uses less digits than its factorization.

420451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22148.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 420451 is about 648.4219305360. The cubic root of 420451 is about 74.9155196916.

Adding to 420451 its reverse (154024), we get a palindrome (574475).

It can be divided in two parts, 420 and 451, that multiplied together give a triangular number (189420 = T₆₁₅).

The spelling of 420451 in words is "four hundred twenty thousand, four hundred fifty-one".