16913887 has 4 divisors (see below), whose sum is σ = 16928136. Its totient is φ = 16899640.

The previous prime is 16913863. The next prime is 16913893. The reversal of 16913887 is 78831961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16913887 - 2¹⁹ = 16389599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16913807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5164 + ... + 7777.

It is an arithmetic number, because the mean of its divisors is an integer number (4232034).

Almost surely, 2^16913887 is an apocalyptic number.

16913887 is a deficient number, since it is larger than the sum of its proper divisors (14249).

16913887 is a wasteful number, since it uses less digits than its factorization.

16913887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14248.

The product of its digits is 72576, while the sum is 43.

The square root of 16913887 is about 4112.6496325362. The cubic root of 16913887 is about 256.6932655480.

The spelling of 16913887 in words is "sixteen million, nine hundred thirteen thousand, eight hundred eighty-seven".