43978 has 8 divisors (see below), whose sum is σ = 72000. Its totient is φ = 19980.

The previous prime is 43973. The next prime is 43987. The reversal of 43978 is 87934.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (43973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 978 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (9000).

2⁴³⁹⁷⁸ is an apocalyptic number.

43978 is a deficient number, since it is larger than the sum of its proper divisors (28022).

43978 is a wasteful number, since it uses less digits than its factorization.

43978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012.

The product of its digits is 6048, while the sum is 31.

The square root of 43978 is about 209.7093226349. The cubic root of 43978 is about 35.2975984584.

Subtracting 43978 from its reverse (87934), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 43978 in words is "forty-three thousand, nine hundred seventy-eight".