681239 has 12 divisors (see below), whose sum is σ = 768600. Its totient is φ = 602784.

The previous prime is 681229. The next prime is 681251. The reversal of 681239 is 932186.

681239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-681239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4832 + ... + 4970.

It is an arithmetic number, because the mean of its divisors is an integer number (64050).

2⁶⁸¹²³⁹ is an apocalyptic number.

681239 is a deficient number, since it is larger than the sum of its proper divisors (87361).

681239 is a wasteful number, since it uses less digits than its factorization.

681239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 181 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 681239 is about 825.3720373262. The cubic root of 681239 is about 87.9899695868.

The spelling of 681239 in words is "six hundred eighty-one thousand, two hundred thirty-nine".