16812993 has 8 divisors (see below), whose sum is σ = 22964256. Its totient is φ = 10935200.

The previous prime is 16812979. The next prime is 16812997. The reversal of 16812993 is 39921861.

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 16812993 - 2¹⁴ = 16796609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16812997) 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, 68223 + ... + 68468.

It is an arithmetic number, because the mean of its divisors is an integer number (2870532).

Almost surely, 2^16812993 is an apocalyptic number.

It is an amenable number.

16812993 is a deficient number, since it is larger than the sum of its proper divisors (6151263).

16812993 is a wasteful number, since it uses less digits than its factorization.

16812993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136735.

The product of its digits is 23328, while the sum is 39.

The square root of 16812993 is about 4100.3649837545. The cubic root of 16812993 is about 256.1818420354.

The spelling of 16812993 in words is "sixteen million, eight hundred twelve thousand, nine hundred ninety-three".