43990320 has 160 divisors (see below), whose sum is σ = 156775680. Its totient is φ = 10091520.

The previous prime is 43990307. The next prime is 43990321. The reversal of 43990320 is 2309934.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (43990321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49722 + ... + 50598.

It is an arithmetic number, because the mean of its divisors is an integer number (979848).

Almost surely, 2^43990320 is an apocalyptic number.

43990320 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 43990320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78387840).

43990320 is an abundant number, since it is smaller than the sum of its proper divisors (112785360).

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

43990320 is a wasteful number, since it uses less digits than its factorization.

43990320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 43990320 is about 6632.5198831213. The cubic root of 43990320 is about 353.0089424127.

The spelling of 43990320 in words is "forty-three million, nine hundred ninety thousand, three hundred twenty".