1681239 has 12 divisors (see below), whose sum is σ = 2607864. Its totient is φ = 960624.

The previous prime is 1681219. The next prime is 1681241. The reversal of 1681239 is 9321861.

It is not a de Polignac number, because 1681239 - 2⁸ = 1680983 is a prime.

1681239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681219) 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 11 ways as a sum of consecutive naturals, for example, 5572 + ... + 5865.

It is an arithmetic number, because the mean of its divisors is an integer number (217322).

2^1681239 is an apocalyptic number.

1681239 is a deficient number, since it is larger than the sum of its proper divisors (926625).

1681239 is a wasteful number, since it uses less digits than its factorization.

1681239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11454 (or 11447 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 1681239 is about 1296.6260062177. The cubic root of 1681239 is about 118.9076561568.

The spelling of 1681239 in words is "one million, six hundred eighty-one thousand, two hundred thirty-nine".