1211830 has 16 divisors (see below), whose sum is σ = 2196720. Its totient is φ = 481312.

The previous prime is 1211827. The next prime is 1211843. The reversal of 1211830 is 381121.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1452 + ... + 2128.

It is an arithmetic number, because the mean of its divisors is an integer number (137295).

2^1211830 is an apocalyptic number.

1211830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211830 is a deficient number, since it is larger than the sum of its proper divisors (984890).

1211830 is a wasteful number, since it uses less digits than its factorization.

1211830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211830 is about 1100.8315039097. The cubic root of 1211830 is about 106.6139170605.

Adding to 1211830 its reverse (381121), we get a palindrome (1592951).

The spelling of 1211830 in words is "one million, two hundred eleven thousand, eight hundred thirty".