1221693 has 8 divisors (see below), whose sum is σ = 1777056. Its totient is φ = 740400.

The previous prime is 1221667. The next prime is 1221707. The reversal of 1221693 is 3961221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221693 - 2¹⁰ = 1220669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18478 + ... + 18543.

It is an arithmetic number, because the mean of its divisors is an integer number (222132).

2^1221693 is an apocalyptic number.

It is an amenable number.

1221693 is a deficient number, since it is larger than the sum of its proper divisors (555363).

1221693 is a wasteful number, since it uses less digits than its factorization.

1221693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37035.

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

The square root of 1221693 is about 1105.3022211142. The cubic root of 1221693 is about 106.9023769679.

The spelling of 1221693 in words is "one million, two hundred twenty-one thousand, six hundred ninety-three".