13821973 has 4 divisors (see below), whose sum is σ = 15078528. Its totient is φ = 12565420.

The previous prime is 13821971. The next prime is 13822007. The reversal of 13821973 is 37912831.

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.

It is a cyclic number.

It is not a de Polignac number, because 13821973 - 2¹ = 13821971 is a prime.

It is a super-2 number, since 2×13821973² = 382093875225458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13821971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628261 + ... + 628282.

It is an arithmetic number, because the mean of its divisors is an integer number (3769632).

Almost surely, 2^13821973 is an apocalyptic number.

It is an amenable number.

13821973 is a deficient number, since it is larger than the sum of its proper divisors (1256555).

13821973 is a wasteful number, since it uses less digits than its factorization.

13821973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256554.

The product of its digits is 9072, while the sum is 34.

The square root of 13821973 is about 3717.7914142673. The cubic root of 13821973 is about 239.9882691025.

The spelling of 13821973 in words is "thirteen million, eight hundred twenty-one thousand, nine hundred seventy-three".