1180821 has 8 divisors (see below), whose sum is σ = 1625344. Its totient is φ = 761760.

The previous prime is 1180819. The next prime is 1180847. The reversal of 1180821 is 1280811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1180821 - 2¹ = 1180819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1180811) 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 7 ways as a sum of consecutive naturals, for example, 6256 + ... + 6441.

It is an arithmetic number, because the mean of its divisors is an integer number (203168).

2^1180821 is an apocalyptic number.

It is an amenable number.

1180821 is a deficient number, since it is larger than the sum of its proper divisors (444523).

1180821 is a wasteful number, since it uses less digits than its factorization.

1180821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12731.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1180821 is about 1086.6558792921. The cubic root of 1180821 is about 105.6966824319.

The spelling of 1180821 in words is "one million, one hundred eighty thousand, eight hundred twenty-one".