1001439 has 6 divisors (see below), whose sum is σ = 1446536. Its totient is φ = 667620.

The previous prime is 1001431. The next prime is 1001447. The reversal of 1001439 is 9341001.

It is an interprime number because it is at equal distance from previous prime (1001431) and next prime (1001447).

It is not a de Polignac number, because 1001439 - 2³ = 1001431 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 (1001431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55627 + ... + 55644.

2^1001439 is an apocalyptic number.

1001439 is a deficient number, since it is larger than the sum of its proper divisors (445097).

1001439 is a wasteful number, since it uses less digits than its factorization.

1001439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111277 (or 111274 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1001439 is about 1000.7192413459. The cubic root of 1001439 is about 100.0479436770.

The spelling of 1001439 in words is "one million, one thousand, four hundred thirty-nine".