3969881 has 4 divisors (see below), whose sum is σ = 3977232. Its totient is φ = 3962532.

The previous prime is 3969871. The next prime is 3969899. The reversal of 3969881 is 1889693.

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: 1889693 = 13 ⋅145361.

It is a cyclic number.

It is not a de Polignac number, because 3969881 - 2¹⁴ = 3953497 is a prime.

It is a super-2 number, since 2×3969881² = 31519910308322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3969811) 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, 2795 + ... + 3968.

It is an arithmetic number, because the mean of its divisors is an integer number (994308).

Almost surely, 2^3969881 is an apocalyptic number.

It is an amenable number.

3969881 is a deficient number, since it is larger than the sum of its proper divisors (7351).

3969881 is an equidigital number, since it uses as much as digits as its factorization.

3969881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7350.

The product of its digits is 93312, while the sum is 44.

The square root of 3969881 is about 1992.4560220994. The cubic root of 3969881 is about 158.3406765446.

The spelling of 3969881 in words is "three million, nine hundred sixty-nine thousand, eight hundred eighty-one".