73996921 has 2 divisors, whose sum is σ = 73996922. Its totient is φ = 73996920.

The previous prime is 73996913. The next prime is 73996927. The reversal of 73996921 is 12969937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40819321 + 33177600 = 6389^2 + 5760^2 .

It is an emirp because it is prime and its reverse (12969937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73996921 - 2³ = 73996913 is a prime.

It is not a weakly prime, because it can be changed into another prime (73996927) 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 as a sum of consecutive naturals, namely, 36998460 + 36998461.

It is an arithmetic number, because the mean of its divisors is an integer number (36998461).

Almost surely, 2^73996921 is an apocalyptic number.

It is an amenable number.

73996921 is a deficient number, since it is larger than the sum of its proper divisors (1).

73996921 is an equidigital number, since it uses as much as digits as its factorization.

73996921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 46.

The square root of 73996921 is about 8602.1463019412. The cubic root of 73996921 is about 419.8278224722.

The spelling of 73996921 in words is "seventy-three million, nine hundred ninety-six thousand, nine hundred twenty-one".