4000243 has 4 divisors (see below), whose sum is σ = 4307968. Its totient is φ = 3692520.

The previous prime is 4000237. The next prime is 4000261. The reversal of 4000243 is 3420004.

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

It is not a de Polignac number, because 4000243 - 2²¹ = 1903091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 307711 = 4000243 / (4 + 0 + 0 + 0 + 2 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4000273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153843 + ... + 153868.

It is an arithmetic number, because the mean of its divisors is an integer number (1076992).

Almost surely, 2^4000243 is an apocalyptic number.

4000243 is a deficient number, since it is larger than the sum of its proper divisors (307725).

4000243 is a wasteful number, since it uses less digits than its factorization.

4000243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307724.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 4000243 is about 2000.0607490774. The cubic root of 4000243 is about 158.7433196189.

Adding to 4000243 its reverse (3420004), we get a palindrome (7420247).

The spelling of 4000243 in words is "four million, two hundred forty-three", and thus it is an aban number.