420554 has 4 divisors (see below), whose sum is σ = 630834. Its totient is φ = 210276.

The previous prime is 420551. The next prime is 420557. The reversal of 420554 is 455024.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (420551) and next prime (420557).

It can be written as a sum of positive squares in only one way, i.e., 390625 + 29929 = 625^2 + 173^2 .

It is not an unprimeable number, because it can be changed into a prime (420551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105137 + ... + 105140.

2⁴²⁰⁵⁵⁴ is an apocalyptic number.

420554 is a deficient number, since it is larger than the sum of its proper divisors (210280).

420554 is a wasteful number, since it uses less digits than its factorization.

420554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210279.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 420554 is about 648.5013492661. The cubic root of 420554 is about 74.9216366695.

Adding to 420554 its reverse (455024), we get a palindrome (875578).

The spelling of 420554 in words is "four hundred twenty thousand, five hundred fifty-four".