1221392 has 20 divisors (see below), whose sum is σ = 2470080. Its totient is φ = 583968.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221392 is 2931221.

It is not an unprimeable number, because it can be changed into a prime (1221391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1292 + ... + 2027.

It is an arithmetic number, because the mean of its divisors is an integer number (123504).

2^1221392 is an apocalyptic number.

It is an amenable number.

1221392 is an abundant number, since it is smaller than the sum of its proper divisors (1248688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221392 is a wasteful number, since it uses less digits than its factorization.

1221392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3350 (or 3344 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 1221392 is about 1105.1660508720. The cubic root of 1221392 is about 106.8935967320.

The spelling of 1221392 in words is "one million, two hundred twenty-one thousand, three hundred ninety-two".