1221393 has 16 divisors (see below), whose sum is σ = 1713600. Its totient is φ = 772800.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221393 is 3931221.

It is a happy number.

It is not a de Polignac number, because 1221393 - 2¹ = 1221391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8718 + ... + 8856.

It is an arithmetic number, because the mean of its divisors is an integer number (107100).

2^1221393 is an apocalyptic number.

It is an amenable number.

1221393 is a deficient number, since it is larger than the sum of its proper divisors (492207).

1221393 is a wasteful number, since it uses less digits than its factorization.

1221393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272.

The product of its digits is 324, while the sum is 21.

The square root of 1221393 is about 1105.1665032926. The cubic root of 1221393 is about 106.8936259046.

The spelling of 1221393 in words is "one million, two hundred twenty-one thousand, three hundred ninety-three".