1221896 has 32 divisors (see below), whose sum is σ = 2553600. Its totient is φ = 544320.

The previous prime is 1221863. The next prime is 1221907. The reversal of 1221896 is 6981221.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3035 + ... + 3413.

It is an arithmetic number, because the mean of its divisors is an integer number (79800).

2^1221896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276800).

1221896 is an abundant number, since it is smaller than the sum of its proper divisors (1331704).

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

1221896 is a wasteful number, since it uses less digits than its factorization.

1221896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 425 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 1221896 is about 1105.3940473876. The cubic root of 1221896 is about 106.9082977082.

The spelling of 1221896 in words is "one million, two hundred twenty-one thousand, eight hundred ninety-six".