1190921 has 4 divisors (see below), whose sum is σ = 1200144. Its totient is φ = 1181700.

The previous prime is 1190911. The next prime is 1190923. The reversal of 1190921 is 1290911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1290911 = 257 ⋅5023.

It is a cyclic number.

It is not a de Polignac number, because 1190921 - 2¹⁰ = 1189897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1190923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4415 + ... + 4676.

It is an arithmetic number, because the mean of its divisors is an integer number (300036).

2^1190921 is an apocalyptic number.

It is an amenable number.

1190921 is a deficient number, since it is larger than the sum of its proper divisors (9223).

1190921 is an equidigital number, since it uses as much as digits as its factorization.

1190921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1190921 is about 1091.2932694743. The cubic root of 1190921 is about 105.9971816030.

The spelling of 1190921 in words is "one million, one hundred ninety thousand, nine hundred twenty-one".