73908409 has 3 divisors (see below), whose sum is σ = 73917007. Its totient is φ = 73899812.

The previous prime is 73908403. The next prime is 73908413. The reversal of 73908409 is 90480937.

The square root of 73908409 is 8597.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 52490025 + 21418384 = 7245^2 + 4628^2 .

It is not a de Polignac number, because 73908409 - 2¹⁷ = 73777337 is a prime.

It is a super-2 number, since 2×73908409² = 10924905841822562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73908403) 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 in 2 ways as a sum of consecutive naturals, for example, 4299 + ... + 12895.

Almost surely, 2^73908409 is an apocalyptic number.

73908409 is the 8597-th square number.

73908409 is the 4299-th centered octagonal number.

It is an amenable number.

73908409 is a deficient number, since it is larger than the sum of its proper divisors (8598).

73908409 is an frugal number, since it uses more digits than its factorization.

73908409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17194 (or 8597 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The cubic root of 73908409 is about 419.6603622324.

The spelling of 73908409 in words is "seventy-three million, nine hundred eight thousand, four hundred nine".