73991393 has 8 divisors (see below), whose sum is σ = 84655488. Its totient is φ = 63350784.

The previous prime is 73991381. The next prime is 73991399. The reversal of 73991393 is 39319937.

It is a happy number.

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

It is not a de Polignac number, because 73991393 - 2⁶ = 73991329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73991399) 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, 1505 + ... + 12257.

It is an arithmetic number, because the mean of its divisors is an integer number (10581936).

Almost surely, 2^73991393 is an apocalyptic number.

It is an amenable number.

73991393 is a deficient number, since it is larger than the sum of its proper divisors (10664095).

73991393 is a wasteful number, since it uses less digits than its factorization.

73991393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11743.

The product of its digits is 137781, while the sum is 44.

The square root of 73991393 is about 8601.8249807817. The cubic root of 73991393 is about 419.8173676858.

The spelling of 73991393 in words is "seventy-three million, nine hundred ninety-one thousand, three hundred ninety-three".