1236139 has 4 divisors (see below), whose sum is σ = 1248480. Its totient is φ = 1223800.

The previous prime is 1236077. The next prime is 1236161. The reversal of 1236139 is 9316321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1236139 - 2¹⁷ = 1105067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1236239) 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, 6019 + ... + 6220.

It is an arithmetic number, because the mean of its divisors is an integer number (312120).

2^1236139 is an apocalyptic number.

1236139 is a deficient number, since it is larger than the sum of its proper divisors (12341).

1236139 is a wasteful number, since it uses less digits than its factorization.

1236139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12340.

The product of its digits is 972, while the sum is 25.

The square root of 1236139 is about 1111.8178807700. The cubic root of 1236139 is about 107.3220853749.

The spelling of 1236139 in words is "one million, two hundred thirty-six thousand, one hundred thirty-nine".