3989969 has 4 divisors (see below), whose sum is σ = 4097844. Its totient is φ = 3882096.

The previous prime is 3989963. The next prime is 3989983. The reversal of 3989969 is 9699893.

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 2140369 + 1849600 = 1463^2 + 1360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3989969 is a prime.

It is a super-2 number, since 2×3989969² = 31839705241922, 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 3989969.

It is not an unprimeable number, because it can be changed into a prime (3989963) 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, 53882 + ... + 53955.

It is an arithmetic number, because the mean of its divisors is an integer number (1024461).

Almost surely, 2^3989969 is an apocalyptic number.

It is an amenable number.

3989969 is a deficient number, since it is larger than the sum of its proper divisors (107875).

3989969 is a wasteful number, since it uses less digits than its factorization.

3989969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107874.

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

The square root of 3989969 is about 1997.4906758230. The cubic root of 3989969 is about 158.6073006217.

It can be divided in two parts, 39899 and 69, that multiplied together give a triangular number (2753031 = T₂₃₄₆).

The spelling of 3989969 in words is "three million, nine hundred eighty-nine thousand, nine hundred sixty-nine".