43426 has 4 divisors (see below), whose sum is σ = 65142. Its totient is φ = 21712.

The previous prime is 43411. The next prime is 43427. The reversal of 43426 is 62434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 40401 + 3025 = 201^2 + 55^2 .

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43427) by changing a digit.

43426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855 + ... + 10858.

2⁴³⁴²⁶ is an apocalyptic number.

43426 is a deficient number, since it is larger than the sum of its proper divisors (21716).

43426 is a wasteful number, since it uses less digits than its factorization.

43426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21715.

The product of its digits is 576, while the sum is 19.

The square root of 43426 is about 208.3890592138. The cubic root of 43426 is about 35.1492942453.

The spelling of 43426 in words is "forty-three thousand, four hundred twenty-six".