3989943 has 12 divisors (see below), whose sum is σ = 6066840. Its totient is φ = 2519856.

The previous prime is 3989941. The next prime is 3989957. The reversal of 3989943 is 3499893.

It is not a de Polignac number, because 3989943 - 2¹ = 3989941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11496 + ... + 11837.

It is an arithmetic number, because the mean of its divisors is an integer number (505570).

Almost surely, 2^3989943 is an apocalyptic number.

3989943 is a deficient number, since it is larger than the sum of its proper divisors (2076897).

3989943 is a wasteful number, since it uses less digits than its factorization.

3989943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23358 (or 23355 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 3989943 is about 1997.4841676469. The cubic root of 3989943 is about 158.6069561079.

The spelling of 3989943 in words is "three million, nine hundred eighty-nine thousand, nine hundred forty-three".