3924989 has 4 divisors (see below), whose sum is σ = 3969180. Its totient is φ = 3880800.

The previous prime is 3924959. The next prime is 3925013. The reversal of 3924989 is 9894293.

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 2805625 + 1119364 = 1675^2 + 1058^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3924989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3924929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21962 + ... + 22139.

It is an arithmetic number, because the mean of its divisors is an integer number (992295).

Almost surely, 2^3924989 is an apocalyptic number.

It is an amenable number.

3924989 is a deficient number, since it is larger than the sum of its proper divisors (44191).

3924989 is an equidigital number, since it uses as much as digits as its factorization.

3924989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44190.

The product of its digits is 139968, while the sum is 44.

The square root of 3924989 is about 1981.1584994644. The cubic root of 3924989 is about 157.7415659841.

It can be divided in two parts, 39249 and 89, that multiplied together give a square (3493161 = 1869²).

The spelling of 3924989 in words is "three million, nine hundred twenty-four thousand, nine hundred eighty-nine".