3996989 has 4 divisors (see below), whose sum is σ = 4232124. Its totient is φ = 3761856.

The previous prime is 3996977. The next prime is 3997001. The reversal of 3996989 is 9896993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9896993 = 151 ⋅65543.

It is an interprime number because it is at equal distance from previous prime (3996977) and next prime (3997001).

It can be written as a sum of positive squares in 2 ways, for example, as 2220100 + 1776889 = 1490^2 + 1333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3996989 is a prime.

It is a super-2 number, since 2×3996989² = 31951842132242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3996989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3996919) 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, 117542 + ... + 117575.

It is an arithmetic number, because the mean of its divisors is an integer number (1058031).

Almost surely, 2^3996989 is an apocalyptic number.

It is an amenable number.

3996989 is a deficient number, since it is larger than the sum of its proper divisors (235135).

3996989 is a wasteful number, since it uses less digits than its factorization.

3996989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235134.

The product of its digits is 944784, while the sum is 53.

The square root of 3996989 is about 1999.2471082885. The cubic root of 3996989 is about 158.7002646604.

The spelling of 3996989 in words is "three million, nine hundred ninety-six thousand, nine hundred eighty-nine".