43217940 has 24 divisors (see below), whose sum is σ = 121010400. Its totient is φ = 11524768.

The previous prime is 43217929. The next prime is 43217947. The reversal of 43217940 is 4971234.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 43217898 and 43217907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43217947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360090 + ... + 360209.

It is an arithmetic number, because the mean of its divisors is an integer number (5042100).

Almost surely, 2^43217940 is an apocalyptic number.

It is an amenable number.

43217940 is an abundant number, since it is smaller than the sum of its proper divisors (77792460).

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

43217940 is a wasteful number, since it uses less digits than its factorization.

43217940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720311 (or 720309 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 43217940 is about 6574.0352904438. The cubic root of 43217940 is about 350.9306930471.

The spelling of 43217940 in words is "forty-three million, two hundred seventeen thousand, nine hundred forty".