1221976 has 16 divisors (see below), whose sum is σ = 2618640. Its totient is φ = 523680.

The previous prime is 1221971. The next prime is 1222003. The reversal of 1221976 is 6791221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221971) 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, 10855 + ... + 10966.

It is an arithmetic number, because the mean of its divisors is an integer number (163665).

2^1221976 is an apocalyptic number.

It is an amenable number.

1221976 is an abundant number, since it is smaller than the sum of its proper divisors (1396664).

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

1221976 is a wasteful number, since it uses less digits than its factorization.

1221976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21834 (or 21830 counting only the distinct ones).

The product of its digits is 1512, while the sum is 28.

The square root of 1221976 is about 1105.4302329862. The cubic root of 1221976 is about 106.9106308247.

It can be divided in two parts, 1221 and 976, that added together give a cube (2197 = 13³).

The spelling of 1221976 in words is "one million, two hundred twenty-one thousand, nine hundred seventy-six".