1231439 has 4 divisors (see below), whose sum is σ = 1343400. Its totient is φ = 1119480.

The previous prime is 1231423. The next prime is 1231453. The reversal of 1231439 is 9341321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1231439 - 2⁴ = 1231423 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 (1231459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55964 + ... + 55985.

It is an arithmetic number, because the mean of its divisors is an integer number (335850).

2^1231439 is an apocalyptic number.

1231439 is a deficient number, since it is larger than the sum of its proper divisors (111961).

1231439 is a wasteful number, since it uses less digits than its factorization.

1231439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111960.

The product of its digits is 648, while the sum is 23.

The square root of 1231439 is about 1109.7022123074. The cubic root of 1231439 is about 107.1858939912.

The spelling of 1231439 in words is "one million, two hundred thirty-one thousand, four hundred thirty-nine".