43261440 has 160 divisors (see below), whose sum is σ = 142598016. Its totient is φ = 11182080.

The previous prime is 43261411. The next prime is 43261451. The reversal of 43261440 is 4416234.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 43261440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330175 + ... + 330305.

Almost surely, 2^43261440 is an apocalyptic number.

43261440 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 43261440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71299008).

43261440 is an abundant number, since it is smaller than the sum of its proper divisors (99336576).

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

43261440 is a wasteful number, since it uses less digits than its factorization.

43261440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 43261440 is about 6577.3429285693. The cubic root of 43261440 is about 351.0483939086.

Adding to 43261440 its reverse (4416234), we get a palindrome (47677674).

The spelling of 43261440 in words is "forty-three million, two hundred sixty-one thousand, four hundred forty".