1191000 has 64 divisors (see below), whose sum is σ = 3725280. Its totient is φ = 316800.

The previous prime is 1190983. The next prime is 1191011. The reversal of 1191000 is 1911.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2802 + ... + 3198.

2^1191000 is an apocalyptic number.

1191000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1191000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1862640).

1191000 is an abundant number, since it is smaller than the sum of its proper divisors (2534280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1191000 is a wasteful number, since it uses less digits than its factorization.

1191000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 1191000 is about 1091.3294644607. The cubic root of 1191000 is about 105.9995253331. Note that the first 3 decimals are identical.

Adding to 1191000 its reverse (1911), we get a palindrome (1192911).

The spelling of 1191000 in words is "one million, one hundred ninety-one thousand".