1180021 has 8 divisors (see below), whose sum is σ = 1280664. Its totient is φ = 1082880.

The previous prime is 1180019. The next prime is 1180027. The reversal of 1180021 is 1200811.

It can be written as a sum of positive squares in 4 ways, for example, as 45796 + 1134225 = 214^2 + 1065^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1180021 - 2¹ = 1180019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1179983 and 1180010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1180027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (160083).

2^1180021 is an apocalyptic number.

It is an amenable number.

1180021 is a deficient number, since it is larger than the sum of its proper divisors (100643).

1180021 is a wasteful number, since it uses less digits than its factorization.

1180021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1180021 is about 1086.2877151105. The cubic root of 1180021 is about 105.6728073910.

Adding to 1180021 its reverse (1200811), we get a palindrome (2380832).

The spelling of 1180021 in words is "one million, one hundred eighty thousand, twenty-one".