1391139 has 6 divisors (see below), whose sum is σ = 2009436. Its totient is φ = 927420.

The previous prime is 1391129. The next prime is 1391183. The reversal of 1391139 is 9311931.

It is not a de Polignac number, because 1391139 - 2⁷ = 1391011 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1391119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77277 + ... + 77294.

It is an arithmetic number, because the mean of its divisors is an integer number (334906).

2^1391139 is an apocalyptic number.

1391139 is a deficient number, since it is larger than the sum of its proper divisors (618297).

1391139 is a wasteful number, since it uses less digits than its factorization.

1391139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154577 (or 154574 counting only the distinct ones).

The product of its digits is 729, while the sum is 27.

The square root of 1391139 is about 1179.4655569367. The cubic root of 1391139 is about 111.6323777794.

The spelling of 1391139 in words is "one million, three hundred ninety-one thousand, one hundred thirty-nine".