43121280 has 128 divisors (see below), whose sum is σ = 141396480. Its totient is φ = 11169792.

The previous prime is 43121263. The next prime is 43121291. The reversal of 43121280 is 8212134.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 70737 + ... + 71343.

It is an arithmetic number, because the mean of its divisors is an integer number (1104660).

Almost surely, 2^43121280 is an apocalyptic number.

43121280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43121280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70698240).

43121280 is an abundant number, since it is smaller than the sum of its proper divisors (98275200).

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

43121280 is a wasteful number, since it uses less digits than its factorization.

43121280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 43121280 is about 6566.6795262141. The cubic root of 43121280 is about 350.6688705945.

The spelling of 43121280 in words is "forty-three million, one hundred twenty-one thousand, two hundred eighty".