2001439 has 8 divisors (see below), whose sum is σ = 2225232. Its totient is φ = 1784640.

The previous prime is 2001421. The next prime is 2001449. The reversal of 2001439 is 9341002.

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

It is not a de Polignac number, because 2001439 - 2⁵ = 2001407 is a prime.

It is a Duffinian number.

2001439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001409) 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, 1134 + ... + 2299.

It is an arithmetic number, because the mean of its divisors is an integer number (278154).

2^2001439 is an apocalyptic number.

2001439 is a deficient number, since it is larger than the sum of its proper divisors (223793).

2001439 is a wasteful number, since it uses less digits than its factorization.

2001439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2001439 is about 1414.7222342213. The cubic root of 2001439 is about 126.0223148518.

The spelling of 2001439 in words is "two million, one thousand, four hundred thirty-nine".