3986993 has 4 divisors (see below), whose sum is σ = 4221540. Its totient is φ = 3752448.

The previous prime is 3986989. The next prime is 3986999. The reversal of 3986993 is 3996893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3996893 = 43 ⋅92951.

It can be written as a sum of positive squares in 2 ways, for example, as 1760929 + 2226064 = 1327^2 + 1492^2 .

It is a cyclic number.

It is not a de Polignac number, because 3986993 - 2² = 3986989 is a prime.

It is a super-2 number, since 2×3986993² = 31792226364098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3986999) 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, 117248 + ... + 117281.

It is an arithmetic number, because the mean of its divisors is an integer number (1055385).

Almost surely, 2^3986993 is an apocalyptic number.

It is an amenable number.

3986993 is a deficient number, since it is larger than the sum of its proper divisors (234547).

3986993 is a wasteful number, since it uses less digits than its factorization.

3986993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234546.

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

The square root of 3986993 is about 1996.7456022238. The cubic root of 3986993 is about 158.5678573136.

The spelling of 3986993 in words is "three million, nine hundred eighty-six thousand, nine hundred ninety-three".