1838221 has 8 divisors (see below), whose sum is σ = 2291904. Its totient is φ = 1432320.

The previous prime is 1838209. The next prime is 1838233. The reversal of 1838221 is 1228381.

It is an interprime number because it is at equal distance from previous prime (1838209) and next prime (1838233).

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 1838221 - 2⁹ = 1837709 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 (1838521) 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, 11860 + ... + 12013.

It is an arithmetic number, because the mean of its divisors is an integer number (286488).

2^1838221 is an apocalyptic number.

1838221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1838221 is a deficient number, since it is larger than the sum of its proper divisors (453683).

1838221 is a wasteful number, since it uses less digits than its factorization.

1838221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23891.

The product of its digits is 768, while the sum is 25.

The square root of 1838221 is about 1355.8100899462. The cubic root of 1838221 is about 122.4990087383.

The spelling of 1838221 in words is "one million, eight hundred thirty-eight thousand, two hundred twenty-one".