73970209 has 4 divisors (see below), whose sum is σ = 73994004. Its totient is φ = 73946416.

The previous prime is 73970207. The next prime is 73970233. The reversal of 73970209 is 90207937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90207937 = 43 ⋅2097859.

It can be written as a sum of positive squares in 2 ways, for example, as 37246609 + 36723600 = 6103^2 + 6060^2 .

It is a cyclic number.

It is not a de Polignac number, because 73970209 - 2¹ = 73970207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73970207) 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, 6382 + ... + 13735.

It is an arithmetic number, because the mean of its divisors is an integer number (18498501).

Almost surely, 2^73970209 is an apocalyptic number.

It is an amenable number.

73970209 is a deficient number, since it is larger than the sum of its proper divisors (23795).

73970209 is a wasteful number, since it uses less digits than its factorization.

73970209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23794.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 73970209 is about 8600.5935260306. The cubic root of 73970209 is about 419.7772987912. Note that the first 3 decimals are identical.

The spelling of 73970209 in words is "seventy-three million, nine hundred seventy thousand, two hundred nine".