16887431 has 8 divisors (see below), whose sum is σ = 18518544. Its totient is φ = 15272320.

The previous prime is 16887419. The next prime is 16887439. The reversal of 16887431 is 13478861.

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 16887431 - 2¹⁰ = 16886407 is a prime.

It is a super-2 number, since 2×16887431² = 570370651559522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16887439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1730 + ... + 6063.

It is an arithmetic number, because the mean of its divisors is an integer number (2314818).

Almost surely, 2^16887431 is an apocalyptic number.

16887431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16887431 is a deficient number, since it is larger than the sum of its proper divisors (1631113).

16887431 is a wasteful number, since it uses less digits than its factorization.

16887431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8001.

The product of its digits is 32256, while the sum is 38.

The square root of 16887431 is about 4109.4319558791. The cubic root of 16887431 is about 256.5593593897.

It can be divided in two parts, 1688 and 7431, that added together give a palindrome (9119).

The spelling of 16887431 in words is "sixteen million, eight hundred eighty-seven thousand, four hundred thirty-one".