73139209 has 8 divisors (see below), whose sum is σ = 85925952. Its totient is φ = 61375440.

The previous prime is 73139201. The next prime is 73139243. The reversal of 73139209 is 90293137.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73139209 - 2³ = 73139201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73139201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255589 + ... + 255874.

It is an arithmetic number, because the mean of its divisors is an integer number (10740744).

Almost surely, 2^73139209 is an apocalyptic number.

It is an amenable number.

73139209 is a deficient number, since it is larger than the sum of its proper divisors (12786743).

73139209 is a wasteful number, since it uses less digits than its factorization.

73139209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511487.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 73139209 is about 8552.1464557151. The cubic root of 73139209 is about 418.1994137910.

The spelling of 73139209 in words is "seventy-three million, one hundred thirty-nine thousand, two hundred nine".