3993961 has 4 divisors (see below), whose sum is σ = 4023252. Its totient is φ = 3964672.

The previous prime is 3993959. The next prime is 3993991. The reversal of 3993961 is 1693993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 913936 + 3080025 = 956^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 3993961 - 2¹ = 3993959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3993901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14440 + ... + 14713.

It is an arithmetic number, because the mean of its divisors is an integer number (1005813).

Almost surely, 2^3993961 is an apocalyptic number.

It is an amenable number.

3993961 is a deficient number, since it is larger than the sum of its proper divisors (29291).

3993961 is a wasteful number, since it uses less digits than its factorization.

3993961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29290.

The product of its digits is 39366, while the sum is 40.

The square root of 3993961 is about 1998.4896797332. The cubic root of 3993961 is about 158.6601790025.

Subtracting from 3993961 its reverse (1693993), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 39939 and 61, that added together give a square (40000 = 200²).

The spelling of 3993961 in words is "three million, nine hundred ninety-three thousand, nine hundred sixty-one".