2021439 has 8 divisors (see below), whose sum is σ = 3080320. Its totient is φ = 1155096.

The previous prime is 2021431. The next prime is 2021471. The reversal of 2021439 is 9341202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021439 - 2³ = 2021431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 96259 = 2021439 / (2 + 0 + 2 + 1 + 4 + 3 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48109 + ... + 48150.

It is an arithmetic number, because the mean of its divisors is an integer number (385040).

2^2021439 is an apocalyptic number.

2021439 is a deficient number, since it is larger than the sum of its proper divisors (1058881).

2021439 is an equidigital number, since it uses as much as digits as its factorization.

2021439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96269.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 2021439 is about 1421.7731886627. The cubic root of 2021439 is about 126.4406966843.

The spelling of 2021439 in words is "two million, twenty-one thousand, four hundred thirty-nine".