43121440 has 48 divisors (see below), whose sum is σ = 102506040. Its totient is φ = 17141760.

The previous prime is 43121423. The next prime is 43121459. The reversal of 43121440 is 4412134.

It can be written as a sum of positive squares in 4 ways, for example, as 14348944 + 28772496 = 3788^2 + 5364^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28216 + ... + 29704.

Almost surely, 2^43121440 is an apocalyptic number.

43121440 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 43121440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51253020).

43121440 is an abundant number, since it is smaller than the sum of its proper divisors (59384600).

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

43121440 is a wasteful number, since it uses less digits than its factorization.

43121440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 43121440 is about 6566.6917089201. The cubic root of 43121440 is about 350.6693043088.

Adding to 43121440 its reverse (4412134), we get a palindrome (47533574).

The spelling of 43121440 in words is "forty-three million, one hundred twenty-one thousand, four hundred forty".