3943987 has 4 divisors (see below), whose sum is σ = 3954040. Its totient is φ = 3933936.

The previous prime is 3943967. The next prime is 3943993. The reversal of 3943987 is 7893493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7893493 = 19 ⋅415447.

It is a cyclic number.

It is not a de Polignac number, because 3943987 - 2⁷ = 3943859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3943937) 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, 4413 + ... + 5230.

It is an arithmetic number, because the mean of its divisors is an integer number (988510).

Almost surely, 2^3943987 is an apocalyptic number.

3943987 is a deficient number, since it is larger than the sum of its proper divisors (10053).

3943987 is an equidigital number, since it uses as much as digits as its factorization.

3943987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052.

The product of its digits is 163296, while the sum is 43.

The square root of 3943987 is about 1985.9473809746. The cubic root of 3943987 is about 157.9956602985.

It can be divided in two parts, 394 and 3987, that multiplied together give a triangular number (1570878 = T₁₇₇₂).

The spelling of 3943987 in words is "three million, nine hundred forty-three thousand, nine hundred eighty-seven".