551421440 has 40 divisors (see below), whose sum is σ = 1322125200. Its totient is φ = 220567552.

The previous prime is 551421433. The next prime is 551421443. The reversal of 551421440 is 44124155.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551421443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105140 + ... + 110259.

It is an arithmetic number, because the mean of its divisors is an integer number (33053130).

Almost surely, 2^551421440 is an apocalyptic number.

It is an amenable number.

551421440 is an abundant number, since it is smaller than the sum of its proper divisors (770703760).

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

551421440 is an equidigital number, since it uses as much as digits as its factorization.

551421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215422 (or 215406 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 551421440 is about 23482.3644465373. The cubic root of 551421440 is about 820.0264913115.

Adding to 551421440 its reverse (44124155), we get a palindrome (595545595).

The spelling of 551421440 in words is "five hundred fifty-one million, four hundred twenty-one thousand, four hundred forty".