3989961 has 12 divisors (see below), whose sum is σ = 5843188. Its totient is φ = 2623104.

The previous prime is 3989957. The next prime is 3989963. The reversal of 3989961 is 1699893.

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 962361 = 1740^2 + 981^2 .

It is not a de Polignac number, because 3989961 - 2² = 3989957 is a prime.

It is a Duffinian number.

3989961 is a lucky number.

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 11 ways as a sum of consecutive naturals, for example, 2380 + ... + 3693.

Almost surely, 2^3989961 is an apocalyptic number.

It is an amenable number.

3989961 is a deficient number, since it is larger than the sum of its proper divisors (1853227).

3989961 is a wasteful number, since it uses less digits than its factorization.

3989961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6152 (or 6149 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 3989961 is about 1997.4886733096. The cubic root of 3989961 is about 158.6071946176.

It can be divided in two parts, 3989 and 961, that added together give a triangular number (4950 = T₉₉).

The spelling of 3989961 in words is "three million, nine hundred eighty-nine thousand, nine hundred sixty-one".