43978212 has 72 divisors (see below), whose sum is σ = 115944192. Its totient is φ = 14040000.

The previous prime is 43978211. The next prime is 43978213. The reversal of 43978212 is 21287934.

43978212 is a `hidden beast` number, since 439 + 7 + 8 + 212 = 666.

It is an interprime number because it is at equal distance from previous prime (43978211) and next prime (43978213).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (43978211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175087 + ... + 175337.

It is an arithmetic number, because the mean of its divisors is an integer number (1610336).

Almost surely, 2^43978212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43978212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57972096).

43978212 is an abundant number, since it is smaller than the sum of its proper divisors (71965980).

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

43978212 is a wasteful number, since it uses less digits than its factorization.

43978212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 444 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 43978212 is about 6631.6070450533. The cubic root of 43978212 is about 352.9765517679.

The spelling of 43978212 in words is "forty-three million, nine hundred seventy-eight thousand, two hundred twelve".