891239 has 2 divisors, whose sum is σ = 891240. Its totient is φ = 891238.

The previous prime is 891223. The next prime is 891251. The reversal of 891239 is 932198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891239 - 2⁴ = 891223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445619 + 445620.

It is an arithmetic number, because the mean of its divisors is an integer number (445620).

2⁸⁹¹²³⁹ is an apocalyptic number.

891239 is a deficient number, since it is larger than the sum of its proper divisors (1).

891239 is an equidigital number, since it uses as much as digits as its factorization.

891239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 891239 is about 944.0545535084. The cubic root of 891239 is about 96.2346329545.

The spelling of 891239 in words is "eight hundred ninety-one thousand, two hundred thirty-nine".