1238689 has 4 divisors (see below), whose sum is σ = 1242180. Its totient is φ = 1235200.

The previous prime is 1238687. The next prime is 1238693. The reversal of 1238689 is 9868321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9868321 = 197 ⋅50093.

It can be written as a sum of positive squares in 2 ways, for example, as 1192464 + 46225 = 1092^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238689 - 2¹ = 1238687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1238681) 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, 1144 + ... + 1945.

It is an arithmetic number, because the mean of its divisors is an integer number (310545).

2^1238689 is an apocalyptic number.

It is an amenable number.

1238689 is a deficient number, since it is larger than the sum of its proper divisors (3491).

1238689 is an equidigital number, since it uses as much as digits as its factorization.

1238689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490.

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

The square root of 1238689 is about 1112.9640605159. The cubic root of 1238689 is about 107.3958320301.

The spelling of 1238689 in words is "one million, two hundred thirty-eight thousand, six hundred eighty-nine".