1221964 has 12 divisors (see below), whose sum is σ = 2190888. Its totient is φ = 596000.

The previous prime is 1221959. The next prime is 1221971. The reversal of 1221964 is 4691221.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3562 + ... + 3889.

It is an arithmetic number, because the mean of its divisors is an integer number (182574).

2^1221964 is an apocalyptic number.

It is an amenable number.

1221964 is a deficient number, since it is larger than the sum of its proper divisors (968924).

1221964 is a wasteful number, since it uses less digits than its factorization.

1221964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7496 (or 7494 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 1221964 is about 1105.4248052220. The cubic root of 1221964 is about 106.9102808637.

The spelling of 1221964 in words is "one million, two hundred twenty-one thousand, nine hundred sixty-four".