43216840 has 32 divisors (see below), whose sum is σ = 97676280. Its totient is φ = 17208832.

The previous prime is 43216837. The next prime is 43216847. The reversal of 43216840 is 4861234.

It can be written as a sum of positive squares in 4 ways, for example, as 23020804 + 20196036 = 4798^2 + 4494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43216799 and 43216808.

It is not an unprimeable number, because it can be changed into a prime (43216847) 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, 7002 + ... + 11638.

Almost surely, 2^43216840 is an apocalyptic number.

43216840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43216840 is an abundant number, since it is smaller than the sum of its proper divisors (54459440).

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

43216840 is a wasteful number, since it uses less digits than its factorization.

43216840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4881 (or 4877 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 43216840 is about 6573.9516274460. The cubic root of 43216840 is about 350.9277156799.

The spelling of 43216840 in words is "forty-three million, two hundred sixteen thousand, eight hundred forty".