3993689 has 4 divisors (see below), whose sum is σ = 4564224. Its totient is φ = 3423156.

The previous prime is 3993683. The next prime is 3993701. The reversal of 3993689 is 9863993.

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: 9863993 = 883 ⋅11171.

It is a cyclic number.

It is not a de Polignac number, because 3993689 - 2¹² = 3989593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3993683) 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, 285257 + ... + 285270.

It is an arithmetic number, because the mean of its divisors is an integer number (1141056).

Almost surely, 2^3993689 is an apocalyptic number.

It is an amenable number.

3993689 is a deficient number, since it is larger than the sum of its proper divisors (570535).

3993689 is an equidigital number, since it uses as much as digits as its factorization.

3993689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570534.

The product of its digits is 314928, while the sum is 47.

The square root of 3993689 is about 1998.4216271848. The cubic root of 3993689 is about 158.6565771856.

The spelling of 3993689 in words is "three million, nine hundred ninety-three thousand, six hundred eighty-nine".