1187139 has 16 divisors (see below), whose sum is σ = 1699200. Its totient is φ = 734976.

The previous prime is 1187117. The next prime is 1187141. The reversal of 1187139 is 9317811.

It is not a de Polignac number, because 1187139 - 2⁵ = 1187107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1187159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3187 + ... + 3539.

It is an arithmetic number, because the mean of its divisors is an integer number (106200).

2^1187139 is an apocalyptic number.

1187139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1187139 is a deficient number, since it is larger than the sum of its proper divisors (512061).

1187139 is a wasteful number, since it uses less digits than its factorization.

1187139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434.

The product of its digits is 1512, while the sum is 30.

The square root of 1187139 is about 1089.5590851349. The cubic root of 1187139 is about 105.8848577657.

It can be divided in two parts, 1187 and 139, that added together give a triangular number (1326 = T₅₁).

The spelling of 1187139 in words is "one million, one hundred eighty-seven thousand, one hundred thirty-nine".