1231939 has 4 divisors (see below), whose sum is σ = 1304424. Its totient is φ = 1159456.

The previous prime is 1231889. The next prime is 1231943. The reversal of 1231939 is 9391321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9391321 = 149 ⋅63029.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36217 + ... + 36250.

It is an arithmetic number, because the mean of its divisors is an integer number (326106).

2^1231939 is an apocalyptic number.

1231939 is a deficient number, since it is larger than the sum of its proper divisors (72485).

1231939 is an equidigital number, since it uses as much as digits as its factorization.

1231939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72484.

The product of its digits is 1458, while the sum is 28.

The square root of 1231939 is about 1109.9274751082. The cubic root of 1231939 is about 107.2003988903.

The spelling of 1231939 in words is "one million, two hundred thirty-one thousand, nine hundred thirty-nine".