67921943 has 2 divisors, whose sum is σ = 67921944. Its totient is φ = 67921942.

The previous prime is 67921883. The next prime is 67921949. The reversal of 67921943 is 34912976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67921943 - 2⁸ = 67921687 is a prime.

It is a super-2 number, since 2×67921943² = 9226780681790498, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67921943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67921949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33960971 + 33960972.

It is an arithmetic number, because the mean of its divisors is an integer number (33960972).

Almost surely, 2^67921943 is an apocalyptic number.

67921943 is a deficient number, since it is larger than the sum of its proper divisors (1).

67921943 is an equidigital number, since it uses as much as digits as its factorization.

67921943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 67921943 is about 8241.4769914136. The cubic root of 67921943 is about 408.0092730655.

It can be divided in two parts, 679 and 21943, that added together give a palindrome (22622).

The spelling of 67921943 in words is "sixty-seven million, nine hundred twenty-one thousand, nine hundred forty-three".