1220394 has 32 divisors (see below), whose sum is σ = 2851200. Its totient is φ = 348096.

The previous prime is 1220393. The next prime is 1220411. The reversal of 1220394 is 4930221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1220394.

It is not an unprimeable number, because it can be changed into a prime (1220393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1762 + ... + 2354.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2^1220394 is an apocalyptic number.

1220394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425600).

1220394 is an abundant number, since it is smaller than the sum of its proper divisors (1630806).

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

1220394 is an equidigital number, since it uses as much as digits as its factorization.

1220394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1220394 is about 1104.7144427407. The cubic root of 1220394 is about 106.8644745286.

The spelling of 1220394 in words is "one million, two hundred twenty thousand, three hundred ninety-four".