67821973 has 4 divisors (see below), whose sum is σ = 67932160. Its totient is φ = 67711788.

The previous prime is 67821961. The next prime is 67821997. The reversal of 67821973 is 37912876.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-67821973 is a prime.

It is a super-2 number, since 2×67821973² = 9199640043225458, 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 (67821073) 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, 54165 + ... + 55402.

It is an arithmetic number, because the mean of its divisors is an integer number (16983040).

Almost surely, 2^67821973 is an apocalyptic number.

It is an amenable number.

67821973 is a deficient number, since it is larger than the sum of its proper divisors (110187).

67821973 is a wasteful number, since it uses less digits than its factorization.

67821973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110186.

The product of its digits is 127008, while the sum is 43.

The square root of 67821973 is about 8235.4097044409. The cubic root of 67821973 is about 407.8090004534.

The spelling of 67821973 in words is "sixty-seven million, eight hundred twenty-one thousand, nine hundred seventy-three".