43409920 has 80 divisors (see below), whose sum is σ = 107635968. Its totient is φ = 16773120.

The previous prime is 43409911. The next prime is 43409923. The reversal of 43409920 is 2990434.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43409923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79087 + ... + 79633.

Almost surely, 2^43409920 is an apocalyptic number.

43409920 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 43409920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53817984).

43409920 is an abundant number, since it is smaller than the sum of its proper divisors (64226048).

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

43409920 is an equidigital number, since it uses as much as digits as its factorization.

43409920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 43409920 is about 6588.6204929408. The cubic root of 43409920 is about 351.4495528991.

The spelling of 43409920 in words is "forty-three million, four hundred nine thousand, nine hundred twenty".