551438 has 4 divisors (see below), whose sum is σ = 827160. Its totient is φ = 275718.

The previous prime is 551423. The next prime is 551443. The reversal of 551438 is 834155.

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

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 551438.

It is an unprimeable number.

551438 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 as a sum of consecutive naturals, namely, 137858 + ... + 137861.

It is an arithmetic number, because the mean of its divisors is an integer number (206790).

2⁵⁵¹⁴³⁸ is an apocalyptic number.

551438 is a deficient number, since it is larger than the sum of its proper divisors (275722).

551438 is a wasteful number, since it uses less digits than its factorization.

551438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275721.

The product of its digits is 2400, while the sum is 26.

The square root of 551438 is about 742.5887152388. The cubic root of 551438 is about 82.0034700098.

It can be divided in two parts, 55143 and 8, that multiplied together give a palindrome (441144).

The spelling of 551438 in words is "five hundred fifty-one thousand, four hundred thirty-eight".