1188139 has 4 divisors (see below), whose sum is σ = 1217160. Its totient is φ = 1159120.

The previous prime is 1188073. The next prime is 1188149. The reversal of 1188139 is 9318811.

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 1188139 - 2¹³ = 1179947 is a prime.

It is a Duffinian number.

1188139 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1188139.

It is not an unprimeable number, because it can be changed into a prime (1188149) 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, 14449 + ... + 14530.

It is an arithmetic number, because the mean of its divisors is an integer number (304290).

2^1188139 is an apocalyptic number.

1188139 is a deficient number, since it is larger than the sum of its proper divisors (29021).

1188139 is an equidigital number, since it uses as much as digits as its factorization.

1188139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29020.

The product of its digits is 1728, while the sum is 31.

The square root of 1188139 is about 1090.0178897614. The cubic root of 1188139 is about 105.9145805251.

The spelling of 1188139 in words is "one million, one hundred eighty-eight thousand, one hundred thirty-nine".