16143987 has 4 divisors (see below), whose sum is σ = 21525320. Its totient is φ = 10762656.

The previous prime is 16143979. The next prime is 16143991. The reversal of 16143987 is 78934161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78934161 = 3 ⋅26311387.

It is not a de Polignac number, because 16143987 - 2³ = 16143979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16143917) 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, 2690662 + ... + 2690667.

It is an arithmetic number, because the mean of its divisors is an integer number (5381330).

Almost surely, 2^16143987 is an apocalyptic number.

16143987 is a deficient number, since it is larger than the sum of its proper divisors (5381333).

16143987 is an equidigital number, since it uses as much as digits as its factorization.

16143987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381332.

The product of its digits is 36288, while the sum is 39.

The square root of 16143987 is about 4017.9580634944. The cubic root of 16143987 is about 252.7378381834.

The spelling of 16143987 in words is "sixteen million, one hundred forty-three thousand, nine hundred eighty-seven".