1139971 has 4 divisors (see below), whose sum is σ = 1302832. Its totient is φ = 977112.

The previous prime is 1139959. The next prime is 1139989. The reversal of 1139971 is 1799311.

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 1139971 - 2⁷ = 1139843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1139911) 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, 81420 + ... + 81433.

It is an arithmetic number, because the mean of its divisors is an integer number (325708).

2^1139971 is an apocalyptic number.

1139971 is a deficient number, since it is larger than the sum of its proper divisors (162861).

1139971 is an equidigital number, since it uses as much as digits as its factorization.

1139971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162860.

The product of its digits is 1701, while the sum is 31.

The square root of 1139971 is about 1067.6942446225. The cubic root of 1139971 is about 104.4635068655.

The spelling of 1139971 in words is "one million, one hundred thirty-nine thousand, nine hundred seventy-one".