551420 has 24 divisors (see below), whose sum is σ = 1176000. Its totient is φ = 217152.

The previous prime is 551407. The next prime is 551423. The reversal of 551420 is 24155.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551420.

It is not an unprimeable number, because it can be changed into a prime (551423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1406 + ... + 1754.

It is an arithmetic number, because the mean of its divisors is an integer number (49000).

2⁵⁵¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

551420 is an abundant number, since it is smaller than the sum of its proper divisors (624580).

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

551420 is a wasteful number, since it uses less digits than its factorization.

551420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 551420 is about 742.5765953759. The cubic root of 551420 is about 82.0025777496.

Adding to 551420 its reverse (24155), we get a palindrome (575575).

The spelling of 551420 in words is "five hundred fifty-one thousand, four hundred twenty".