1973221 has 4 divisors (see below), whose sum is σ = 1983744. Its totient is φ = 1962700.

The previous prime is 1973203. The next prime is 1973233. The reversal of 1973221 is 1223791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1223791 = 379 ⋅3229.

It is a cyclic number.

It is not a de Polignac number, because 1973221 - 2¹⁵ = 1940453 is a prime.

It is a super-2 number, since 2×1973221² = 7787202229682, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1973261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4975 + ... + 5356.

It is an arithmetic number, because the mean of its divisors is an integer number (495936).

2^1973221 is an apocalyptic number.

It is an amenable number.

1973221 is a deficient number, since it is larger than the sum of its proper divisors (10523).

1973221 is a wasteful number, since it uses less digits than its factorization.

1973221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10522.

The product of its digits is 756, while the sum is 25.

The square root of 1973221 is about 1404.7138498641. The cubic root of 1973221 is about 125.4272526442.

The spelling of 1973221 in words is "one million, nine hundred seventy-three thousand, two hundred twenty-one".