1239871 has 4 divisors (see below), whose sum is σ = 1242144. Its totient is φ = 1237600.

The previous prime is 1239839. The next prime is 1239877. The reversal of 1239871 is 1789321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1789321 = 1279 ⋅1399.

It is a cyclic number.

It is not a de Polignac number, because 1239871 - 2⁵ = 1239839 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 (1239877) 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, 231 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (310536).

2^1239871 is an apocalyptic number.

1239871 is a deficient number, since it is larger than the sum of its proper divisors (2273).

1239871 is an equidigital number, since it uses as much as digits as its factorization.

1239871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272.

The product of its digits is 3024, while the sum is 31.

The square root of 1239871 is about 1113.4949483496. The cubic root of 1239871 is about 107.4299814460.

The spelling of 1239871 in words is "one million, two hundred thirty-nine thousand, eight hundred seventy-one".