73808921 has 4 divisors (see below), whose sum is σ = 74498832. Its totient is φ = 73119012.

The previous prime is 73808899. The next prime is 73808953. The reversal of 73808921 is 12980837.

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 73808921 - 2²² = 69614617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73808981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344795 + ... + 345008.

It is an arithmetic number, because the mean of its divisors is an integer number (18624708).

Almost surely, 2^73808921 is an apocalyptic number.

It is an amenable number.

73808921 is a deficient number, since it is larger than the sum of its proper divisors (689911).

73808921 is a wasteful number, since it uses less digits than its factorization.

73808921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689910.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 73808921 is about 8591.2118469981. The cubic root of 73808921 is about 419.4719762808.

The spelling of 73808921 in words is "seventy-three million, eight hundred eight thousand, nine hundred twenty-one".