3921489 has 36 divisors (see below), whose sum is σ = 6729268. Its totient is φ = 2185920.

The previous prime is 3921451. The next prime is 3921497. The reversal of 3921489 is 9841293.

It can be written as a sum of positive squares in 2 ways, for example, as 627264 + 3294225 = 792^2 + 1815^2 .

It is not a de Polignac number, because 3921489 - 2⁹ = 3920977 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921499) 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 35 ways as a sum of consecutive naturals, for example, 14019 + ... + 14295.

Almost surely, 2^3921489 is an apocalyptic number.

3921489 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

3921489 is a deficient number, since it is larger than the sum of its proper divisors (2807779).

3921489 is a wasteful number, since it uses less digits than its factorization.

3921489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 304 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 3921489 is about 1980.2749809054. The cubic root of 3921489 is about 157.6946648193.

It can be divided in two parts, 392 and 1489, that added together give a palindrome (1881).

The spelling of 3921489 in words is "three million, nine hundred twenty-one thousand, four hundred eighty-nine".