43994 has 4 divisors (see below), whose sum is σ = 65994. Its totient is φ = 21996.

The previous prime is 43991. The next prime is 43997. The reversal of 43994 is 49934.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49934 = 2 ⋅24967.

It is an interprime number because it is at equal distance from previous prime (43991) and next prime (43997).

It can be written as a sum of positive squares in only one way, i.e., 34969 + 9025 = 187^2 + 95^2 .

It is not an unprimeable number, because it can be changed into a prime (43991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10997 + ... + 11000.

2⁴³⁹⁹⁴ is an apocalyptic number.

43994 is a deficient number, since it is larger than the sum of its proper divisors (22000).

43994 is a wasteful number, since it uses less digits than its factorization.

43994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21999.

The product of its digits is 3888, while the sum is 29.

The square root of 43994 is about 209.7474672076. The cubic root of 43994 is about 35.3018785765.

The spelling of 43994 in words is "forty-three thousand, nine hundred ninety-four".