551840 has 24 divisors (see below), whose sum is σ = 1304100. Its totient is φ = 220672.

The previous prime is 551813. The next prime is 551843. The reversal of 551840 is 48155.

It can be written as a sum of positive squares in 2 ways, for example, as 456976 + 94864 = 676^2 + 308^2 .

It is not an unprimeable number, because it can be changed into a prime (551843) by changing a digit.

551840 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 3 ways as a sum of consecutive naturals, for example, 1565 + ... + 1884.

2⁵⁵¹⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

551840 is an abundant number, since it is smaller than the sum of its proper divisors (752260).

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

551840 is a wasteful number, since it uses less digits than its factorization.

551840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464 (or 3456 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 551840 is about 742.8593406561. The cubic root of 551840 is about 82.0233920969.

Adding to 551840 its reverse (48155), we get a palindrome (599995).

The spelling of 551840 in words is "five hundred fifty-one thousand, eight hundred forty".