3933989 has 4 divisors (see below), whose sum is σ = 4105056. Its totient is φ = 3762924.

The previous prime is 3933977. The next prime is 3933997. The reversal of 3933989 is 9893393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9893393 = 37 ⋅267389.

It is a cyclic number.

It is not a de Polignac number, because 3933989 - 2⁴ = 3933973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3933929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85499 + ... + 85544.

It is an arithmetic number, because the mean of its divisors is an integer number (1026264).

Almost surely, 2^3933989 is an apocalyptic number.

It is an amenable number.

3933989 is a deficient number, since it is larger than the sum of its proper divisors (171067).

3933989 is a wasteful number, since it uses less digits than its factorization.

3933989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171066.

The product of its digits is 157464, while the sum is 44.

The square root of 3933989 is about 1983.4285971519. The cubic root of 3933989 is about 157.8620410878.

The spelling of 3933989 in words is "three million, nine hundred thirty-three thousand, nine hundred eighty-nine".