551430 has 48 divisors (see below), whose sum is σ = 1566864. Its totient is φ = 133440.

The previous prime is 551423. The next prime is 551443. The reversal of 551430 is 34155.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 712 + ... + 1268.

It is an arithmetic number, because the mean of its divisors is an integer number (32643).

2⁵⁵¹⁴³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783432).

551430 is an abundant number, since it is smaller than the sum of its proper divisors (1015434).

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

551430 is a wasteful number, since it uses less digits than its factorization.

551430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 551430 is about 742.5833286575. The cubic root of 551430 is about 82.0030734521.

Multiplying 551430 by its sum of digits (18), we get a triangular number (9925740 = T₄₄₅₅).

Adding to 551430 its reverse (34155), we get a palindrome (585585).

It can be divided in two parts, 55 and 1430, that added together give a triangular number (1485 = T₅₄).

The spelling of 551430 in words is "five hundred fifty-one thousand, four hundred thirty".