1971439 has 8 divisors (see below), whose sum is σ = 2112480. Its totient is φ = 1833216.

The previous prime is 1971433. The next prime is 1971443. The reversal of 1971439 is 9341791.

1971439 is nontrivially palindromic in base 6.

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

It is a cyclic number.

It is not a de Polignac number, because 1971439 - 2¹⁹ = 1447151 is a prime.

It is a Duffinian number.

1971439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 862 + ... + 2164.

It is an arithmetic number, because the mean of its divisors is an integer number (264060).

2^1971439 is an apocalyptic number.

1971439 is a deficient number, since it is larger than the sum of its proper divisors (141041).

1971439 is a wasteful number, since it uses less digits than its factorization.

1971439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409.

The product of its digits is 6804, while the sum is 34.

The square root of 1971439 is about 1404.0794137085. The cubic root of 1971439 is about 125.3894838250.

The spelling of 1971439 in words is "one million, nine hundred seventy-one thousand, four hundred thirty-nine".