4021489 has 4 divisors (see below), whose sum is σ = 4115056. Its totient is φ = 3927924.

The previous prime is 4021477. The next prime is 4021513. The reversal of 4021489 is 9841204.

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.

It is a cyclic number.

It is not a de Polignac number, because 4021489 - 2⁹ = 4020977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4021439) 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, 46719 + ... + 46804.

It is an arithmetic number, because the mean of its divisors is an integer number (1028764).

Almost surely, 2^4021489 is an apocalyptic number.

It is an amenable number.

4021489 is a deficient number, since it is larger than the sum of its proper divisors (93567).

4021489 is an equidigital number, since it uses as much as digits as its factorization.

4021489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93566.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 4021489 is about 2005.3650540488. The cubic root of 4021489 is about 159.0238615086.

It can be divided in two parts, 402 and 1489, that added together give a triangular number (1891 = T₆₁).

The spelling of 4021489 in words is "four million, twenty-one thousand, four hundred eighty-nine".