16540993 has 8 divisors (see below), whose sum is σ = 19030400. Its totient is φ = 14083200.

The previous prime is 16540967. The next prime is 16541009. The reversal of 16540993 is 39904561.

16540993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16540993 - 2⁹ = 16540481 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16540913) 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, 6768 + ... + 8881.

It is an arithmetic number, because the mean of its divisors is an integer number (2378800).

Almost surely, 2^16540993 is an apocalyptic number.

It is an amenable number.

16540993 is a deficient number, since it is larger than the sum of its proper divisors (2489407).

16540993 is a wasteful number, since it uses less digits than its factorization.

16540993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15807.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 16540993 is about 4067.0619616623. The cubic root of 16540993 is about 254.7928241635.

The spelling of 16540993 in words is "sixteen million, five hundred forty thousand, nine hundred ninety-three".