1221936 has 20 divisors (see below), whose sum is σ = 3156792. Its totient is φ = 407296.

The previous prime is 1221917. The next prime is 1221937. The reversal of 1221936 is 6391221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1221937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12681 + ... + 12776.

2^1221936 is an apocalyptic number.

1221936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221936 is an abundant number, since it is smaller than the sum of its proper divisors (1934856).

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

1221936 is a wasteful number, since it uses less digits than its factorization.

1221936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25468 (or 25462 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 1221936 is about 1105.4121403350. The cubic root of 1221936 is about 106.9094642792.

The spelling of 1221936 in words is "one million, two hundred twenty-one thousand, nine hundred thirty-six".