1221938 has 4 divisors (see below), whose sum is σ = 1832910. Its totient is φ = 610968.

The previous prime is 1221937. The next prime is 1221959. The reversal of 1221938 is 8391221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1216609 + 5329 = 1103^2 + 73^2 .

It is an Ulam number.

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 as a sum of consecutive naturals, namely, 305483 + ... + 305486.

2^1221938 is an apocalyptic number.

1221938 is a deficient number, since it is larger than the sum of its proper divisors (610972).

1221938 is an equidigital number, since it uses as much as digits as its factorization.

1221938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610971.

The product of its digits is 864, while the sum is 26.

The square root of 1221938 is about 1105.4130449746. The cubic root of 1221938 is about 106.9095226070.

The spelling of 1221938 in words is "one million, two hundred twenty-one thousand, nine hundred thirty-eight".