1236889 has 4 divisors (see below), whose sum is σ = 1241856. Its totient is φ = 1231924.

The previous prime is 1236883. The next prime is 1236901. The reversal of 1236889 is 9886321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9886321 = 307 ⋅32203.

It is a cyclic number.

It is not a de Polignac number, because 1236889 - 2⁵ = 1236857 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1236883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089 + ... + 2614.

It is an arithmetic number, because the mean of its divisors is an integer number (310464).

2^1236889 is an apocalyptic number.

It is an amenable number.

1236889 is a deficient number, since it is larger than the sum of its proper divisors (4967).

1236889 is an equidigital number, since it uses as much as digits as its factorization.

1236889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966.

The product of its digits is 20736, while the sum is 37.

The square root of 1236889 is about 1112.1551150806. The cubic root of 1236889 is about 107.3437860873.

The spelling of 1236889 in words is "one million, two hundred thirty-six thousand, eight hundred eighty-nine".