4009943 has 16 divisors (see below), whose sum is σ = 5013504. Its totient is φ = 3127680.

The previous prime is 4009939. The next prime is 4009991. The reversal of 4009943 is 3499004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 4009943 - 2² = 4009939 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4009913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3146 + ... + 4232.

It is an arithmetic number, because the mean of its divisors is an integer number (313344).

Almost surely, 2^4009943 is an apocalyptic number.

4009943 is a deficient number, since it is larger than the sum of its proper divisors (1003561).

4009943 is a wasteful number, since it uses less digits than its factorization.

4009943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

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

The square root of 4009943 is about 2002.4842071787. The cubic root of 4009943 is about 158.8715257695.

The spelling of 4009943 in words is "four million, nine thousand, nine hundred forty-three".