16387987 has 32 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 11961600.

The previous prime is 16387963. The next prime is 16388011. The reversal of 16387987 is 78978361.

It is an interprime number because it is at equal distance from previous prime (16387963) and next prime (16388011).

It is not a de Polignac number, because 16387987 - 2¹⁹ = 15863699 is a prime.

It is a super-2 number, since 2×16387987² = 537132235824338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16387987.

It is not an unprimeable number, because it can be changed into a prime (16387907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91464 + ... + 91642.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^16387987 is an apocalyptic number.

16387987 is a deficient number, since it is larger than the sum of its proper divisors (5384813).

16387987 is a wasteful number, since it uses less digits than its factorization.

16387987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its digits is 508032, while the sum is 49.

The square root of 16387987 is about 4048.2078750973. The cubic root of 16387987 is about 254.0047687533.

The spelling of 16387987 in words is "sixteen million, three hundred eighty-seven thousand, nine hundred eighty-seven".