1439721 has 8 divisors (see below), whose sum is σ = 2132960. Its totient is φ = 959796.

The previous prime is 1439719. The next prime is 1439729. The reversal of 1439721 is 1279341.

It is not a de Polignac number, because 1439721 - 2¹ = 1439719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 53323 = 1439721 / (1 + 4 + 3 + 9 + 7 + 2 + 1).

It is a Duffinian number.

1439721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1439729) 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, 26635 + ... + 26688.

It is an arithmetic number, because the mean of its divisors is an integer number (266620).

2^1439721 is an apocalyptic number.

It is an amenable number.

1439721 is a deficient number, since it is larger than the sum of its proper divisors (693239).

1439721 is an equidigital number, since it uses as much as digits as its factorization.

1439721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53332 (or 53326 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1439721 is about 1199.8837443686. The cubic root of 1439721 is about 112.9170299654.

The spelling of 1439721 in words is "one million, four hundred thirty-nine thousand, seven hundred twenty-one".