1992221 has 8 divisors (see below), whose sum is σ = 2483904. Its totient is φ = 1552320.

The previous prime is 1992203. The next prime is 1992227. The reversal of 1992221 is 1222991.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-1992221 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 (1992227) 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, 12860 + ... + 13013.

It is an arithmetic number, because the mean of its divisors is an integer number (310488).

2^1992221 is an apocalyptic number.

1992221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1992221 is a deficient number, since it is larger than the sum of its proper divisors (491683).

1992221 is a wasteful number, since it uses less digits than its factorization.

1992221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25891.

The product of its digits is 648, while the sum is 26.

The square root of 1992221 is about 1411.4605910191. The cubic root of 1992221 is about 125.8285439849.

The spelling of 1992221 in words is "one million, nine hundred ninety-two thousand, two hundred twenty-one".