16011993 has 8 divisors (see below), whose sum is σ = 21441888. Its totient is φ = 10628384.

The previous prime is 16011971. The next prime is 16011997. The reversal of 16011993 is 39911061.

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 16011993 - 2⁹ = 16011481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16011993.

It is not an unprimeable number, because it can be changed into a prime (16011997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10755 + ... + 12152.

It is an arithmetic number, because the mean of its divisors is an integer number (2680236).

Almost surely, 2^16011993 is an apocalyptic number.

It is an amenable number.

16011993 is a deficient number, since it is larger than the sum of its proper divisors (5429895).

16011993 is a wasteful number, since it uses less digits than its factorization.

16011993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23143.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 16011993 is about 4001.4988441833. The cubic root of 16011993 is about 252.0471535597.

The spelling of 16011993 in words is "sixteen million, eleven thousand, nine hundred ninety-three".