163408987 has 16 divisors (see below), whose sum is σ = 201160960. Its totient is φ = 129602592.

The previous prime is 163408979. The next prime is 163408991. The reversal of 163408987 is 789804361.

It is a happy number.

It is not a de Polignac number, because 163408987 - 2³ = 163408979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163408907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8568 + ... + 20005.

It is an arithmetic number, because the mean of its divisors is an integer number (12572560).

Almost surely, 2^163408987 is an apocalyptic number.

163408987 is a deficient number, since it is larger than the sum of its proper divisors (37751973).

163408987 is a wasteful number, since it uses less digits than its factorization.

163408987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28642.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 163408987 is about 12783.1524672125. The cubic root of 163408987 is about 546.7120496149.

The spelling of 163408987 in words is "one hundred sixty-three million, four hundred eight thousand, nine hundred eighty-seven".