1127821 has 4 divisors (see below), whose sum is σ = 1187200. Its totient is φ = 1068444.

The previous prime is 1127813. The next prime is 1127837. The reversal of 1127821 is 1287211.

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.

It is a cyclic number.

It is not a de Polignac number, because 1127821 - 2³ = 1127813 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1127792 and 1127801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1127801) 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, 29661 + ... + 29698.

It is an arithmetic number, because the mean of its divisors is an integer number (296800).

2^1127821 is an apocalyptic number.

It is an amenable number.

1127821 is a deficient number, since it is larger than the sum of its proper divisors (59379).

1127821 is an equidigital number, since it uses as much as digits as its factorization.

1127821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59378.

The product of its digits is 224, while the sum is 22.

The square root of 1127821 is about 1061.9891713196. The cubic root of 1127821 is about 104.0910506871.

The spelling of 1127821 in words is "one million, one hundred twenty-seven thousand, eight hundred twenty-one".